If you've been playing a warrior for a long time, you've probably gotten used to the way your three big class abilities work. Presently, Shield Wall, Retaliation and Recklessness are linked abilities with a shared 30 minute cooldown. This means if you use one of them you can't use any of the other two in addition to the one you used for half an hour. Not only has this restriction kept warriors from using any of their big cooldowns in Arenas, it also serves as an inhibitor in raiding and soloing and questing. You don't pop Shield Wall unless you're absolutely sure you're going to die, because then you won't have it for possibly two or three boss attempts.
This will no longer be the case in Wrath. In a move that simultaneously nerfs and buffs these long-standing warrior abilities, the base effect of each has been reduced but their cooldown shortened to 5 minutes. The tooltips of each ability spell it out now. The duration of each has dropped to about 12 seconds (not a huge deal), Recklessness has lost its fear breaking ability, Shield Wall only reduces incoming damage by 50%, and Retaliation only hits 20 attacks now. Yes, these are all nerfs. But the upside of a 5 minute duration makes them far more friendly for use. You can pop shield wall on trash if needed and still have it for a boss. A fury warrior can use reck secure in the knowledge that he'll most likely have it back up by the time the boss hits execute range. And retaliation might even be viable for multi-mob tanking now! A little stance dancing and you don't have to fret that shield wall is gone for half an hour.
To me, this is an awesome change. It makes those abilities less restricted and thus, makes me more willing to use them.