In The Burning Crusade, the 5-mans had trash galore. Five, even six packs in Shadow Labyrinth, constant streams of adds in Shattered Halls, complicated trash pulls in Karazhan and Serpentshrine. I still remember with dread being the tank standing there using spell reflection to get the attention of Hyjal caster waves. Dealing with trash has always been a part of the game, as it has been part of the genre. In fact, one of the reasons that Naxxramas 10/25 felt so empty to me was that it simply held less trash than it did as a 40-man raid at level 60, so huge stretches of the place were deserted, as if Kel'Thuzad had gone on a staff-cutting binge and pink-slipped half of the Scourge before you even got there.
After we'd gotten Ulduar more or less on farm and moved on to Trial of the Crusader, I was pretty ready for a break from trash. I was very excited about a trashless dungeon where you just fought bosses. Wouldn't that be epic? Wouldn't it be awesome for every fight in a raid to be an epic struggle against a named, powerful adversary?
Turned out, not so much.