I am just now rolling 2 druids, and I'm find ing it just as fast, if not faster, than running 4 mages and a 1 priest, and my 5 shaman team. Mobs die just as fast it seems, and there's no downtime between mobs (leveling feral, no mana worry about)

And as said before, the most profitable 4 professions are mining, herbalism, skinning, and enchanting is a good 4th, you can just DE all the random greens you come accross and auction those, rather than vendoring greens, or selling them. Some of the random enchant greens are really awful.

Gather everything in signt, and sell it, and you should make enough to live off of, and maybe a bit more. Then, when you roll 3 more toons, you can use the money and skills from the first 2 to finance their crafting profs