I have little experience with most of these, and I should gain more. Generally I work to improve my motivation, and indirectly have that carry me through. This obviously depends to a great extent on how well you can motivate yourself. I'm not sure this is exactly an anti-akrasia technique, but I would give it somewhat positive ratings.
If curious, my techniques for motivation are very diverse, and examples include reminding myself what is at stake, and recalling motivational ideals and imagery, largely derived from games, movies, and other media. One classic image of mine that was recently useful is that of a character that, if their legs are broken, they will crawl to their objective. John McClane of the Die Hard films somewhat embodies this idea. Useful for adversity and setbacks.
Sometimes I have great motivation for a task but when it comes to the actual execution, hesitation and procrastination persists. Regardless of my motivation, Execution by Default is often what works for me in getting over this, in the situations in which I do. I would give it +7, with a slight variation. The counting does not work well for me as I keep leaving myself a choice at the end of the countdown, whether I will actually follow through. What seems to work is expecting myself to do the task, and watch it from a sort of third-person perspective. Commonly this comes up for intimidating social tasks, and the thoughts are something like "Huh, I'm going to do that. Weird. Oh, here I go". In this way the decision is somewhat distanced, and I'm hardly even making it: I'm just watching myself make it. Somehow this often works, and if I really expect to see myself do something, at some point my body just starts moving. Gauging the effectiveness is difficult, as sometimes I try to set this system in motion but don't really put belief/will into it, and can tell I am doing so. From memory this system actually works, which means if I implement it I'm going to actually do it, and the hesitation is moved forward. An advantage might lie in just doing that, through hyperbolic discounting.
The counting does not work well for me as I keep leaving myself a choice at the end of the countdown, whether I will actually follow through. What seems to work is expecting myself to do the task, and watch it from a sort of third-person perspective.
It almost sounds like you're reviewing two different techniques here: the original Execute by Default and something like PJ Eby's Just Do It tactic. Or is this a third thing?
I recently had occasion to review some of the akrasia tricks I've found on Less Wrong, and it occurred to me that there's probably quite a lot of others who've tried them as well. Perhaps it's a good idea to organize the experiences of a couple dozen procrastinating rationalists?
Therefore, I'll aggregate any such data you provide in the comments, according to the following scheme:
Every so often, I'll combine all the data back into the main post, listing average scores, sample size and common effects for each technique. Ready?
Here's the list of specific akrasia tactics I've found around LW (and also in outside links from here); again, if I'm missing one, let me know and I'll add it. Special thanks to Vladimir Golovin for the Share Your Anti-Akrasia Tricks post.
Without further ado, here are the results so far as I've recorded them, with average score, number of reviews, standard deviation and recurring comments.
3 or More Reviews:
Collaboration with Others: Average +7.7 (3 reviews) (SD 0.6)
No Multitasking: Average +6.0 (3 reviews) (SD 2.0); note variants
P.J. Eby's Motivation Trilogy: Average +5.8 (6 reviews) (SD 3.3)
Monoidealism: Average +8.0 (3 reviews) (SD 2.0)
"Just Do It": Average +4 (2 reviews) (SD 4.2)
Irresistible Instant Motivation: +3 (1 review)
Getting Things Done: Average +4.9 (7 reviews) (SD 2.6)
Regular Exercise: Average +4.4 (5 reviews) (SD 2.3)
Cripple your Internet: Average +4.2 (11 reviews) (SD 3.0)
LeechBlock: Average +5.4 (5 reviews) (SD 2.9); basically everyone who's tried has found it helpful.
PageAddict: +3 (1 review)
Freedom (Mac)
Melatonin: Average +4.0 (5 reviews) (SD 5.4); works well for some, others feel groggy the next day; might help to vary the dosage
Execute by Default: Average +3.7 (7 reviews) (SD 2.4); all sorts of variants; universally helpful, not typically a life-changer.
Pomodoro Technique: Average +3.3 (3 reviews) (SD 4.2); mathemajician suggests a 45-minute variant
Being Watched: Average +3.2 (6 reviews) (SD 4.1); variations like co-working seem more effective; see "collaboration" below
Utility Function Experiment: Average +2.8 (4 reviews) (SD 2.8)
Meditation: Average +2.8 (5 reviews) (SD 2.8)
Modafinil and Equivalents: Average -0.8 (5 reviews) (SD 8.5); fantastic for some, terrible for others. Seriously, look at that standard deviation!
Structured Procrastination: Average -1.0 (3 reviews) (SD 4.4); polarized opinion
Resolutions (Applied Picoeconomics): Average -3.2 (5 reviews) (SD 3.3); easy to fail & get even more demotivated
1 or 2 Reviews:
Dual n-back: Average +6.5 (2 reviews) (SD 2.1)
Think It, Do It: Average +6 (2 reviews) (SD 1.4)
Self-Affirmation: Average +4 (2 reviews) (SD 2.8)
Create Trivial Inconveniences to Procrastination
Close the Dang Browser: Average +3.5 (2 reviews) (SD 3.5)
Get More Sleep: Average +3 (2 reviews) (SD 1.4)
Every Other Day Off: Average +0.5 (2 reviews) (SD 0.7)
Strict Scheduling: Average -9 (2 reviews) (SD 1.4)
Elimination (80/20 Rule): +8 (1 review)
Methylphenidate: +8 (1 review)
Begin Now: +8 (1 review)
Learning to Say No: +8 (1 review)
Caffeine Nap: +8 (1 review)
Write While Doing: +8 (1 review)
Leave Some Tasty Bits: +7 (1 review)
Preserve the Mental State: +6 (1 review)
Acedia and Me: +5 (1 review)
Third Person Perspective: +5 (1 review)
Watching Others: +5 (1 review)
Multiple Selves Theory: +5 (1 review)
Getting Back to the Music: +5 (1 review)
Remove Trivial Inconveniences: +4 (1 review)
Accountability: +2 (1 review)
Scheduling Aggressively...: +2 (1 review)
Autofocus: 0 (1 review)
Take Every Other 20 to 40 Minutes Off: -4 (1 review)
Not Yet Reviewed:
Fire and Motion
Stare at the Wall
Kibotzer
Thanks for your data!
EDIT: People seem to enjoy throwing really low scores out there for things that just didn't work, had some negative side effects and annoyed them. I added "-10 if it nearly killed you" to give a sense of perspective on this bounded scale... although, looking at the comments, it looks like the -10 and -8 were pretty much justified after all. Anyway, here's your anchor for the negative side!