Our team has a high number of extraverts, but the introverts seem just as happy. We have no surly curmudgeons.
When I hired on, I was surprised that so many people rode bikes to work. And when I proposed climbing a local mountain to one similarly outdoorsy co-worker, I was surprised that the whole team was interested. 10 out of the 12 in the office either did the warm-up climb or actually camped out overnight and completed the larger climb (Mt St. Helens). I found this amount of shared lifestyle/outside-interests to be unique among places I've worked. I'm certain we weren't hired because of these interests, but it seems to have worked out that we share a lot of them.