I'm one of these guys. I've got 12 chars on POT5, but the queue makes me mad so I've tried other high pop PVE servers. What I have determined after ALOT of this is that even with half the population, POT5's queue pops quicker. I've heard of people doing the same from JM, I've also met people who switched from JM to POT5 but I haven't seen them around lately so I'm assuming they are back at their old haunts.