As a shaman who mainly does 1 group activities, Call of the Wild is my favorite new aa after being gone for 14 months. It's extremely handy and I have been very glad to have it almost every day. I've rezzed our cleric back into MPG trials, back into places like RSS, etc. Places where it would be difficult or impossible (see invis mobs in the way, etc) for them to run back. Even when it is possible for them to run back, it's such a time saver when you are exping. With the level of my gear + my tanks gear, it is difficult for me to heal for any extended amount of time in places like RSS. Call of the Wild was the first AA I purchased when I returned and leveled to 70 and I haven't regretted it for a second! Spiritual channeling was the second one I purchased.... I did purchase extra spell gem with some refunded AAs I had when I first logged in though.
I think as a raider and with only 100 AA, there is a lot of other AA that would be more useful to you than rez.
Like Spiritual Channeling, Radiant Cure 3, SCS (since you are undergeared with no defensive AA), SCRM, Healing AA, Defensive AA, etc etc.