BOYH is an idea, although it cannot be a "boxed" healer. If you want to run a healer as your "leader" with DPS followers - that's fine. But a macro'd in healer is simply not an option for anything outside your own group.

I did a bit of raiding with a resto shaman up front and 3x elementals in tow. it works. Dave has used his holy pally up front, with dps mages and priests in tow. That works too.

Mindlessly blasting chain heals into the raid group heals - but its not the same.

And the MT should be solo in my opinion - off tanks are doable, but the MT shouldn't be in a boxer group. (yes, I know, I've done it successfully myself - but it wasn't easy, and there was a lot of painful learning lessons along the way)