I actually catch myself doing the same thing he mentions, where you write something and just think it's the greatest thing in the world. I'll write something and then get my room mate or girlfriend to read it because I think its so great, but after a day or two or even just a few hours I come to realize that what I've written is some seriously trite drivel and it needs a total rework.
All it takes is that level of separation he talks about. You should be able to stop looking at something and come back to it at a later time with new eyes. I'm not necessarily going to adhere to the writers methods he describes about keeping a computer draft and tons of paper drafts, but I understand what he means. Maybe I'll start doing something similar.
I like how he sets up all these rules and guidelines for the way he writes, but then at the end he just kind of says, "Don't let anybody tell you how to write, just write." Which is good motivation. No one likes being told what to do, but people certainly will at least listen to humble advice, and this seems humble enough.