Blizzard has put in mechanics that have wrecked server communities and even now they decided to actually wreck servers themselves.
Crz is it's own beast and I don't want to derail the thread.
Before LFD me and guild mates would usually pug a couple spots for dungeons and raids and it was great. We met some awesome people and even gained new guild members that way. That is the type gameplay I liked versus queuing randoms with strangers from other servers.
I do like being to group cross server though but in end game I have always liked meeting people from my server.
(this was typed on iPhone so if there are errors blame apple)