Meh. Honestly I don't think that playing D&D has changed my "quality of life" much one way or the other. I'm pretty confident, from examining the times when I've had to put all the books away or ignore them, that I'm pretty well rounded and it's just another thing I do. If I didn't read gaming rulebooks I'd probably be reading other sorts of books, and when I'm not making friends gaming I pretty much meet people doing other things.
If anything, gaming has been more of cross to bear, a stigma to overcome occasionally because of people's preconceptions about gamers. But I'm realistic enough to note that I'd probably claim some other weird hobby in my youth without gaming being there that would be just as detrimental socially, if not worse. Sometimes these days I wish gaming involved more physical activity, because it would be nice to have a twenty yearish hobby-obsession that kept my belly more fit.
Really though, not much of a change I think, with or without gaming.