The other reason why it doesn't work in the long-term is that you will always be working on things that are adjacent to what's truly important.
Clairvoyance is a better solution. Ever get stuck in a circular argument? After a while, you realize its going nowhere and you walk away. Procrastination, at least in my mind, is almost the same thing. If I let myself observe the mundane things I do, I'll eventually get sick of myself and stop doing it.
Success in dealing with procrastination really a question how viscerally you feel a dead-end coming, and also making the necessary adjustments to remove triggers if its difficult to stop yourself in the act.