ER isn't really a "oh shit" button, else it wouldn't have 1min cd.
It's easy to include ER in a cd rotation and it's great that way.
I mean, in fight where survival matters, I know exactly when I want to use ER and I can save Berserker Rage consequently.
Like, against WotE it was very nice to always have Demoralizing shout or ER up each time you were actually tanking.