Up to now, the only in-person (not online) games I've been in or run have been at college on campus (except for one), so no drinks. Online, one or two players have mentioned playing drunk a few times, but i don't really ask so it's hard to say.
I personally don't drink alcohol at all, ever. And if/when I get a house and DM games from it, there will be a strict no alcohol policy. As for playing at other people's places, I don't think I could tolerate playing in a game with alcohol.
[sblock]The one game I've played at someone's house had a player who seldom drank during the game but seemed to do so before coming and after leaving. My characters almost always echo my personal views on alcohol, and I ended up nearly starting a fight with this guy. My character was in a bar with the party and was "asked" to join in and drink with them. He happened to be a full of himself pretty boy sorcerer, so it felt perfectly in character to reply with something to the effect of (forgot exact words), "I am neither low nor vulgar enough to engorge myself on such foul liquid." I may have also called it a crutch/escape for the weak willed. To which said player got very angry, standing up ready to fight, taking it as a personal attack on him. The DM tried to keep things calm, saying, "He was just roleplaying, that's what his character thinks, not him. Right?" He asked, looking at me. I responded that yes, I was just roleplaying, I didn't actually think that. This was of course a lie to avoid confrontation, and the whole situation left me feeling awkward about the group.[/sblock]