Blizzard seems to be thinking about this for tanks. Here is how they explain the way protection warriors can expend rage in Pandaria:
One of the changes for old time Prot warriors is getting used to not spamming Heroic Strike. Think of HS (and Cleave) as an alternative to Shield Block for times when you don't need to worry about blocking, such as when you are soloing, off-tanking or doing easy content. If you use too many Heroic Strikes, you won't have rage for Shield Block as well. Your other attacks, Devastate, Revenge, Shield Slam and Thunder Clap, should fill in most of the holes in your rotation and should be sufficient for holding threat without HS spam.
Sounds juicy. Will they do something similar for healers, too?