I've only ridden for a couple of years now (well, since I was a kid), and I always ride alone. I don't have any friends who ride, and "real life" doesn't leave time for clubs and such. That and I've never been much into joining clubs anyway.

Alone time on the bike gives me a chance to clear my head and burn off any aggravation after work which is a great thing. I'm pretty sure it works out better for the wife that way, than me bringing a bad attitude home. I set personal speed records after my worst days at work, and after I get home I'm worn out but feeling a lot better.