I did not have a hunched back (that I'm aware of), so my comment may not help you, but I found that a standing desk was more comfortable, and forces me to have a better posture more often than sitting did. I still sometimes lean over to peer at things, but I can no longer slouch back in my chair while coding.

Standing sounds like it would be tiring, but strangely it's never bothered me -- probably because I can change my stance, balance, or even move side-to-side while I'm working (and indeed, did so while typing this). I did not expect to like it as much as I do, but I've been using one for five years now and have few complaints.

edit: The key for me is that my monitor(s) are at eye level, so I don't need to look down. (Laptop screen is an exception, though, and is the main contributor to the discomfort I sometimes feel.)