Like many writers I approach the prospect of rewriting my work with emotions that run the gamut from fierce dislike to fear and loathing. Nobody I know likes to rewrite, particularly to order, and those that do need to be kept under observation. Remember the strange guy who's neighbour's say (while the police dig up his back garden) he seemed like such quiet man, kept himself to himself? That's the kind of person who likes doing rewrites.
In the third instance just as fat man immediately forgets his last meal and starts dreaming of the next(2) so an author is already working on the next book. I don't know a writer who doesn't start thinking about the next book even as he's struggling with the last half of the first, possibly because he is struggling.
The real problem with rewrites is that sooner or later, just like George Takei, you will have to fucking do them. Unless of course you get rich enough to afford the famous Protection from Editors CardTM.
(1) The theological argument is as follows: since only God can be perfect and my first draft was perfect then I must be god QED.
(2) Trust me on this.