I haven't read the whole thread, so I can only give my experience. When I'm sober I have this little voice in my head that says "No, see, people don't like to discuss the evolutionary implications of mate selection in primates during the party after a wedding". Stuff like that is generally what I'm thinking about, but I don't say it. When I'm drunk, that voice goes away. I was once threatened with a crossbow if I didn't shut up and pee (no joke--the exact words, close as I can recall, were "Are you going to shoot me?" "Not if you shut up and pee."). I vaguely recall saying to one woman "You're hot and therefore screwing up my equations. Stop it." Another time I spent an evening trying to find someone who could explain the difference between osteichthese and chondrichthese to me (an issue that had been plaguing me for a while, as I made the mistake of looking at how fish started and the early ones, as is usual, fit neither category and both).
There is a certain randomness to thought that is induced by drinking. It's useful at times. Got to sift through a lot of trash to get to the useful stuff, but the useful stuff can be surprisingly useful. I still swear that whoever invented the Bertrand lens was high as a bloody kite.