Sure there is always something a tank can be doing better but lately I stopped keeping up to date with Warrior tanking Theorycrafting since the for the most part the all a Warrior needs to do is know to keep Shield Slam on priority while facerolling Heroic Strike, tanks that dont know the beauty of Heroic Strike generally suck.
And I'm pretty sure it was Blizzard's intention to make a tanks role in encounters smaller then they used to be since bad tanks are easy to find and they'd rather not punish an entire raid because of it. Like I said I tanked 11/12 Heroic before the inflation of that damn buff and I really dont feel like I deserve to brag much about it.
Marrowgar - I simply need to follow or lead the other tanks around some stupid fire....meanwhile healers need to deal with high incoming damage while avoiding those same fires during the bonestorm.
Lady Deathwhisper - A bit more of a challenge I'll admit what with generating threat, feels like some old school encounters because of her taunt immunity, but tank swapping on Deathwhisper isn't even mandatory because of MD and Trix. Meanwhile a tank with his/her high health pool can disregard the ghost (not recommended) while healers and DPS need to stay on the move while doing their jobs.
Saurfang - I need to press the taunt button, and if assigned Shockwave an add, while ranged deal with adds that can lock them in place that will oneshot them if touched and healers must sustain an insane amount of healing where one wasted global can cost a life. (I've healed it on a paladin and I let a mark die cause I refreshed a Beacon
Festergut - once again hit the taunt button while standing in place, before you could see where the goo would be dropped DPS, and Healing had to maximize performance while watching Putrecide on a balcony chuck goo at you
Putrecide - Main Tank moves boss around depending on the fights current momentum, followed by a series of tank swaps, much more interesting then most other Hardmodes. Meanwhile the rest of the raid deals with that damn plague, goo, and pushing DPS hard enough to kill the Oozes. Votiles need to be handled carefully aswell.
Blood Princes - unless your the tanking the Shadow dude, you basically just stand where you are and move when you see a Shock Vortex spawn. While this fight is a joke on 25 man it's was one of our biggest hurdles in 10 man, since we didn't have much ranged. But as a tank there was jack I could do, or brag about after downing them since I just tanked the two Princes.
Blood Queen - if your raid is reliable enough both tanks can probably find a way to spam a cast sequence macro and go afk until the fear.
Valithria - I've yet to tank this on 25 player to be honest but on 10 man we prefer'd to solo tank it, which was very enjoyable as a warrior, the quick decision making and reaction time needed reminded me of Heroics like Shattered Halls.
Sindragosa - while most people can agree that this fight sucks, at least the tank swap required here isn't just a simple button press and there is more on the line, since many simple errors can cost the fight and I much enjoy the pressure. However I'm sure Healers have it even harder since they also need to clear their stacks, and heal through a lot of raid and tank damage, while making sure they dont blow up their raid in the process.
Lich King - haven't tanked Heroic LK but regular mode pre-buff is far more entertaining then the simple stand in the middle of the room mechanics we normally put up with. Here I'd tank LK in phase one use my vigilance and in combination of a mouse over taunting macro to keep adds on myself. Try to generate as much threat as I could on the raging spirits after picking them up quickly since we normally didn't raid with a hunter/rogue. Then having to move then close to LK w/o getting anyone blasted by their cone damage. Followed by coordinating around defiles, Valk Stuns where also my job and taunting whenever the tank on LK didn't have a CD for Soul Reaper.
So with the exception of a few fights in ICC I'm pretty sure the tank has the easiest job, I almost felt like I was carried to my Kingslayer title and I rarely feel the pressure I used to back in TBC, I only tend to get such feelings from healing these days.