I think this is true for almost anything... exercise, religion, etc. Left to my own devices, I can whittle away the day on the internet reading about my beloved hockey team. GTD - and other productivity/life management systems - help stir me in the right direction... at least some of the time.
Originally Posted by supergtdman
In the spirit of your statement above, I think you'll enjoy Seth Godin's take on GTD and life hacking here