Wow, do I disagree. I use version control (hg) for solo writing, and I'd love to use it for collaboration if I didn't think it would be an uphill slog to convince my coauthors to learn it too.
I'm guessing that you too have opened a recent-but-not-current doc, made changes, added polish etc, only to realise a few hours down the track that you opened a legacy version. Having multiple backups with numbered version names etc is all very well, but when you do it manually and you are working late at night, tired, it's way too easy to screw up up. Better document version control sounds excellent.
