Dungeon works perfectly fine, no buggs whatsoever. It is long and MOST people (you are not in this category) go RDF ONLY FOR emblems of frost. They don't need EoTs from bosses, BoEs, gear, or whatever. They go RDF HC only for that daily reward and they wish to do it as quickly as possible. There are basically three dungeons that people love to skip because of their length - HoR, oculus and CoS. I don't need anything as well but I patiently go those long dungeons anyway, it's not that hard. But I honestly can understand those players frustration. They don't want to rage or make you feel bad or anything. They just want a quick regroup for a chance of a faster dungeon and that's not as toxic as you make it out to be IMO.
As for global chat, people pointed out this problem in here :
http://forum.warmane.com/showthread.php?t=381392 . Basically, the solution is to put global chat in another window and only look it up when you actually need it. You will see all the whispers you want without any issues.