I'm not a major gamer, but was big back in the day. My buddy informed me that Starcraft is now available online for free, so I have played that for a few rounds and it's massively nostalgic.
I do play A LOT of chess online though, and have been spending more time on Twitch watching some of my favorite chess players. I don't really understand why, but watching people play chess, talking about it, listening to music, drinking, etc, is something I could watch for HOURS.