DrunkonDuty
he/him
Oh and to answer the OP: I don't drink when I'm GMing. Anymore. Not after I lost my BBEG who was supposed to be a cunning, use catspaws and sow chaos from behind the scenes type. Had a few beers in me and she went and got all gung-ho and tried to take the PCs in a stand up fight instead of running. SHe got massacred. 
Or to put it more generally: as a GM I have too much going on to try and do it drunk without effecting the quality of the game. One or two tops.
Most of my players don't drink much.
When playing: hey, I'll live up to my ENWorld handle. Beer all the way. Have a preference for James Squire Golden (kinda sweet) or a great beer from NZ, Monteiths Porter (with a depth of flavour and colour like the bowels of the Underdark.) And if I'm watching the pennies then Toohey's Old, another black beer, pretty good for the price.

Or to put it more generally: as a GM I have too much going on to try and do it drunk without effecting the quality of the game. One or two tops.
Most of my players don't drink much.
When playing: hey, I'll live up to my ENWorld handle. Beer all the way. Have a preference for James Squire Golden (kinda sweet) or a great beer from NZ, Monteiths Porter (with a depth of flavour and colour like the bowels of the Underdark.) And if I'm watching the pennies then Toohey's Old, another black beer, pretty good for the price.