I've come across people who don't really ski away from the lift and congregate with their friends there, right in the way of anyone trying to get off the lift. Close enough that if a few more people were in their group, they'd get hit by the chair swinging around.
Sounds like your "congregation point" is a bit closer to the chair than what I'm thinking of, but it sure seems like the "snowboarder code" to stop as in the way as possible when they get off the lifts. A couple of them, of course leads to lots of them, since once there are a couple of boarders blocking the area, there's no place for the rest of them to get past in order to be out of the way while they re-board their boards!
Lifties letting kids hang their way up the lifts, boy, I'm sure glad I haven't seen that one! The liftie issues I've seen have been more that they're not paying attention when people start piling up when one doesn't make it off the chair. It doesn't take long to look like a pile of football players when they're busy staying "warm" in the lift shack at the top. Gotta admire the guys on the bunny hill lift, settling kids on, and scooping the ones who don't quite make it off the chair out of the way before the next tumbler dismounts!
Kano