Sure it is, you drink, you heal, you get praised. Throw either a HoT or a flash heal, or a cast heal.
There may be varying skills of healers, but over all tanking is much much more difficult than healing.
Holding aggro on a Boss (especially if you're unmatched) is a hard thing to do. You need to stack sunders, while making sure he's aggrod while stance dancing back and forth between Battle and Defensive stance whenever Mocking Blow cools down if you lose the aggro. Then you have the wildcards like Challenging Shout and Thunderclap to help with multiplemob tanking.
Especially Protected Warriors, we have to try to hardest to be the best. It's much more than Charge->Threat Modifier we also need to watch our limited supply of rage, make sure our shouts are buffed (2m cooldown..), keep mobs who run hamstringed, etc.
I know healing isn't the easiest thing in the world, but it doesn't hold a cadle to how hard tanking can be.