Omen? That, and enabling "show enemy nameplates" are all I really consider mandatory for tanking. Your keybinds and UI will do more for your tanking than any addon, omen will simply tell you if you need to kick it up a notch threatwise or if you have a lock and can go take a piss while they kill the mob you're tanking.
That is pretty much it, show enemy name plates is key, I use aloft which has a better design then the default, also when somebody starts to get over your threat the aura around the mobs nameplate turns from ret to orange before it goes after them.
Would that also move their nameplates at all? The normal default is pretty much smooshed right on the mobs head and it gets difficult to pick one someone in a pack. Maybe it never changed, but it seems to me the faceplates have been pushed into the actual mob more than they used to.
This change is in the patch notes.
You can change it back in interface options. However, you can repeatedly click one spot of the gaggle of nameplates and it will select the different mobs in the pack.
And another nod to Omen + nameplates.
I'll have to look, I simply noticed the nameplates hovering nicely over them to being squashed down to the mob itself.
I'm getting 3500-4000 Howling Blast crits at 76 in tank gear...I see where you're coming from with the AoE threat.
We had such a dominant group last night running instances through the dungeon finder that I was tanking in DPS gear, Blood Spec and in Blood Presence..and I still tanked it without going below like 70% health...yay for competent healers!
Everybody in our group (levels 74-76) was pulling 1500-2200 DPS..i've been with several 80's that do half that.