Leveling without RAF sucks immensely.

Late WotLK, I leveled 4x Druids (well 5x) to join my existing druid.
And that was without RAF.
The composition (leveling as Feral) was quite fun so I basically played them all the way through.

This expansion... late Cataclysm...
I am in the process of leveling 5x Paladins to 80th.
At which point, one will drop and a DK will join them.
I envision 4x Rets + 1x Frost DK (AoE DeathGrip & Purge away bubbles/iceblocks) as the main spec.
But going with an off-spec of 4x Holy and 1x Blood (because many are stupid and will target the lead toon, plus this will allow for easier taking out the opposing General in AV/IoC).
Leveling without RAF blows...

I've got baby Warlocks...
4x Warlock, 1x Priest...
At the low 20's.
But that's another team, without RAF.
Maybe towards the end of MoP.