I'm racinggirl on Ravelry. I too like the patterns, pattern notes, yarn and project management tools. I'm only in a few groups and my most active are two sock knitting groups and because they're focused we keep on topic and help and encourage each other, so I haven't experienced any issues there. It can, however, be incredibly overwhelming though, and I've found so many patterns to knit that I'll have to live for a couple of hundred years just to make a dent in it all!
I like this site very much too, for some of the same reasons, and also because it's smaller and more friendly. I LOVE Amy's free videos and was so smitten with them that it took me months before I even noticed there was a FORUM tab!
I've also knitted patterns from the extensive pattern list that's here too.
Lot's of good stuff on both site, I pick and chose more on Ravelry, but I read more forums and posts on this site.