Maybe it comes down to how you model the minds of those around you, but I notice a pattern in articles like this, that the solution seems to be presented as universal. In my experience, deadlines, especially self-imposed ones, are very effective for some (say 40%) of people, but they're not a panacea.
Wouldn't it be nice if there was some more general theory that explained Parkinson's law, and suggested various solutions that will work for various people?
> I love deadlines. I love the whooshing noise they make as they go by. - Douglas Adams