My warrior can barely heal herself when tanking and that is a good thing. Warriors can only heal themselves after they get a kill. This is as it should be.
Other tank classes specs can heal themselves far too much. This unbalances healing, tanking and the classes in general. If a class can heal itself too much when tanking, it hides whatever strengths or weaknesses that tank spec might otherwise have.
Enough blizzard, let healers heal and tanks tank.
Edit: this post was supposed to go in the dungeons, raids etc forum.