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It's absolutely useful. Is it necessary? Not really. One example of a useful situation is Zul'jin, where he'll randomly charge someone and do ~16,000 physical, mitigatable, damage over 6 seconds. The current solution, if he Claw Rages a tree, is to shift to bear and have the other healer or two keep you up, so you don't waste a BoP that would be better used on a priest. In the Imp Tree Form version, you just stay in tree form, heal yourself, and move on with your life. Saves the mana of a couple form changes, and doesn't force you to lose your lifebloom stack on the tank.
So, situationally useful on gimmicky fights in raids, or fairly useful in heroics when the occasional mob gets loose. Being a non-squishy healer is never a bad thing, it's just not really necessary.
Of course, that's the PvE answer. There's obviously major use for it in PvP.
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