I only visit one other forum. It's a site for fucking Gamemaker games of all things. The odd thing is that 2 of them specifically are really good. Really, really well done and fun to play. Of the 2 games, there's a fucking tough-as-nails platformer with randomly generated levels and a basebuilding FPS that is currently in alpha. There's also a neat TDS, but the community around it is fucking awful.
Also, most of the people are fucking annoying and/or immature.
http://forums.reflectgames.com/