I can't think of any substantial piece of code I've written that I haven't wanted to rewrite immediately after finishing it. There is always something I figure out can be done better or differently. I don't think I've ever had such a dramatic experience with it as you, but I can relate.

I'm actually going to have the opportunity to do a complete refactoring and implementation of a big project I wrote last year. I'm looking forward to doing the project over "right" this time.