ive found that using taunt is a waste of time unless fighting a boss that occasionally drops aggro and runs off to someone else. then ill use it. otherwise ill never use it.
You don't run many 5-mans with normal groups do you? Especially fights like Utgarde Pinacle gauntlet. Vigilance is a godsend there especially when you are constantly getting rooted with no pally in the group. Taunt Taunt Taunt Taunt, TC, win!