Op must not be playing MoP because here how WoW breaks down:
Vanilla - not alt friendly
TBC - not alt friendly
WotLK - alt friendly
Cataclysm - alt friendly
MoP- not alt friendly
Sure, you might be able to have a max level toon of every class now because leveling is so comparatively fast, but those alts have shit gear, shit reputation and no chance of getting into a raid or heroic dungeon without some work.
I have 21 toons that were max level or thereabouts before MoP dropped. Since that day, I have only played one (a new monk) and he's still not exalted with all the factions.