After about a week, here are my results.

Using this plugin has forced me to notice that I have a bad work algorithm: when I hit a roadblock in coding or writing or whatever and I can't immediately see my way through it, I go to the Internet. The plugin basically halts this particular algorithm - when I try to use the Internet I get bored of waiting after about five seconds and go back to working, and usually figure out whatever the problem was.

I quickly realized that some discipline is still required. I have a smartphone, so I have to force myself not to simply use the smartphone for internet distraction. Additionally I convince myself that it would be shameful to find some other workaround like using my remote machine or one of my virtual machines.

Overall, I believe this made my workweek more productive. We'll see if I manage to work around my own convictions and find other ways of distracting myself.