The OPs biggest problem is he is comparing harbor quests in DDO to endgame content in WOW.

Did you happen to run any 1-60 dungeons in WOW in the past year? They are actually worse zergs than DDO. You don´t need a tank or a healer AND you don´t need anyone to take care of traps because there are none. There is also no need to buff anything in WOW... in DDO, in the leveling dungeons, buffs make things go much faster and you often need someone to do traps.