Brez is available to all specs. However unlike MotW it is advantageous to have more than one.
I totally agree with the barkskin. Seems like utility that would totally fit with resto Druid.
A little history on lifebloom. During TBC it was standard to roll lifeblooms on as many tanks as you could then fill any open GCDs with other spells. When WotLK came out this practice despite mana cost rising continued. So when Ulduar came out blizzard implemented the system we have now that makes rolling very expensive. It worked we no longer could roll on multiple tanks. However the spell became so complicated and cumbersome that they desired to revert it back to the old lifebloom and to prevent Druids from once again stacking it on multiple tanks they instigated the 1 target at a time.
Moral of the story it is much better to roll than to slow roll.