I am never going to level my alts - I just keep spending my time collecting more pets and more pets.
So true, I have 5 toons sitting at 85-86. Between pet tamer dailies for bags and leveling lowbie pets, artifact hunting, trying to valor cap on 2 90s through dailies, heroics, lfr, scenarios, old raids for mog, legendaries (25 weeks of ulduar and counting lol), achievements, I have no time in game to level alts.
Although I do remember reading a blue post saying this expansion is not friendly to altoholics like us. In cata I had all the time in the world for alts even when raiding.