Deadlines keep you ALIVE - a blog post
kanebennett.wordpress.com
kanebennett.wordpress.com
When you're setting deadlines that only you know of, there is no possibility of getting "punished" so it's much easier to procrastinate. If it works for you, cool, but I know it doesn't work for me and most likely it doesn't work for the majority of people.
I'm not sure if you're trying to be self deprecating with that "overly simplified graph" line. Either way, I wouldn't panic about it too much. Kathy Sierra wrote some of the best user experience writing on the internet using diagrams that were just as simplistic.