This just sound weird to me.. lol.. Maybe to much beer..
You used RAF to lvl up 5 accounts? Multiboxing?
I assume you only lvl'd dps classes then and not running with a dedicated healer.
Because you always "park" your healer more or less.
Sure you use separate movement keys for slaves and so, but i think you will have problems tanking encounters with a lot of movement and at the same time moving with your "healer" slave toon at some other direction.
I have been boxing now and then in Uld 25 with 2 or 3 of my shamans, but only as dps when we have been running through alts and have been short on ppl. Its more then doable, but both tanking and healing most of the encounters. That will be hard to pull off imo.
Anyway, GL with that though. Would like to hear how it went for ya.