Hayao Miyazaki, Turning Point 1997-2008:
Making films is all about — as soon as you're finished — continually regretting what you've done. When we look at films we've made, all we can see are the flaws; we can't even watch them in a normal way. I never feel like watching my own films again. So unless I start working on a new one, I'll never be free from the curse of the last one. I'm serious. Unless I start working on the next film, the last one will be a drag on me for another two or three years.
The same can be said for software development, although developers must maintain their creations as reminders of their own mistakes.