When I am busy and trying to work/get some peace and quiet it can be a bit annoying when I see groups of people treating a GC as some sort of big night out, getting pissed, being loud and generally adopting a "look at me aren't I important" type attitude. Then again, that's just occasional, and on those occasions it's fair to say I am being a grumpy old man. And it is also fair to say that on occasions I have been in the lounge with friends, and the alcohol has been free flowing, and the atmosphere has been jovial, so at the end of day I say live and let live.
But, yes, all of the things mentioned by the OP can be quite annoying, to varying degrees. I'll add another. People who stand by the buffet inspecting food closely but not seemingly with any intention of serving themselves, and seemingly oblivious to the fact that there are around six people waiting behind them to serve themselves. They should be sin binned.