Nice post!

To look at a small part, I share the interest in GTD and have been quite happily applying some of it for years. What I do miss is a bit of systematic evaluation of these things; Getting Things Done versus the 7 Habits versus the Pomodoro Technique and two-hundred other methods, which all seem to have their followers and seem to make sense, but lack hard supporting data (or?), in a field susceptible to placebo-effects, selection-bias, 'believers' and so on.