It always boggles my mind when I hear people complain about having to complete quests based on XP/per Minute and how it is not fun...
If you are doing a recreational activity and your not having fun, than you're doing it wrong.
I like to mix questing up, while some story lines are fun to run in succession others it is more fun to break them up with single series quests.
Sometimes I enjoy taking it slower and other nights hit the ground running and don't stop until we reach the end.
What I have found is that the ZERG Groups (Even TR's) is not the dominate groupings out there, just the more vocal.
Play a game to have fun.