I don't think combo points can transfer, although there might be something in MoP for that.

The 5x Mangle (step 1, of the castsequence) kills outright basically everything, questing.

The full rotation with the finisher, which gets you the insta-cast (under 10 seconds base cast time) nature spell, almost never reaches the finisher.
But it is in there, for the few elites who are higher level than the party... which you're supposed to use an item to summon aid or weaken them... I was able to kill everything questing, except the fire guy in Hyjal (who you're supposed to run away from)... via brute force with the druids (my Paladin & 4x DK's failed on three battles that the Ferals won).