Before the Xpac, I was the MT in Scholo with my warrior and the only healer in the group with my priest. The great thing about it was that there was no "heal lag" - it usually takes a second to see the damage that a tank just took - but seeing it from the tank's point of view I always knew what badness was about to happen. With the priest's group heal spells this is actually not too bad.

The issue is on multi-tank pulls. Warriors are so bad with AoE threat, and they take so much micro, that I wouldn't really recommend it in more "modern" instances.