Just a profile i have been working on for 80-85. Its not 100% AFK yet so i cant really say its my best work (see below)
You can start this at 79 at Nordrassil in Hyjal its got a filler so it will kill elementals till 80, at which point it starts questing. i think it will get to 81.5-82 from quests on my bots with heirlooms.. then there is a grind filler after the quests, if you leave it long enough you can get 85.
if someone can try with alliance and let me know if it works that would be cool.
Known issues:
Only part which makes this non afk is the pathing on quest "barron geddon" which should be about 15 minutes in. The bot will die here if left AFK and the pathing from the GY back you your corpse is bad so the bot will get stuck. once you have completed that quest its all AFK though.
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