Why are some folks so AGAINST marking? It takes literally half a second, can be done on the run as you are coming up to the pull, and gives people a nice visual sequence to remind them of which monsters are most dangerous and which can be mostly ignored. More AoE would be nice to clear the packs out faster, but right now there's not enough to justify making a healer's life harder if she wants to put a few monsters to sleep.

I see no reason NOT to do it. If it seriously detracted from my ability to tank a dungeon I'd say yea, it's wasting too much time. But it doesn't. Smash a macro 3-4 times to number them up as you come up to them and then start your pull. I'm usually done before I'm even in shield lob\tomahawk range.