I was at AK last week, and although they didn't totally ruin my trip or anything, I did run into the following annoyances:
1) They were all heading one way down a path and I was heading the other. I had nowhere to go, but they were pretty much going to run me down. I had to hold the pointy end of my water bottle out in front of me, and after five or six of them walked into it they got the hint and moved over.
2) The constant, ear-splitting chanting while they wait in line. I pity any migraine sufferers who might have been waiting around me.
3) On Kilimanjaro, there were two Brazilian groups in front of me, and they didn't fill the jeeps...they were loading 'em based on directions from the group leader, which means they were going out half filled. Pissed me off because it make the line go MUCH slower. Make 'em back on and fill the freakin' vehicle!
4) On Everest, as I was exiting, about a dozen of them had literally just sat down on the floor of the store where you exit! People were tripping and stumbling all over trying to get around them...a CM was trying to get them to get up.