Sorry for the delay getting back to you. Here is the path I pretty much feel comfortable AFKing:
Ragefire Chasm
Stockade
Scarlet Monastery: Library
Scarlet Monastery: Graveyard
Scarlet Monastery: Armory
Razorfen Kraul
Zul'farrak
Sunken Temple
Hellfire Ramparts
Blood Furnace
Underbog
Mana Tombs
Sethekk Halls
Utgarde Keep
Nexus
Drak'tharon Keep
Halls of Stone
That's usually what I run when I'm afk. For instance, I'm leveling a new toon right now and am in the 69-72 range. I'm run UK/Nexus/DTK while I'm not even home. I know there are others that have been tagged as afkable, but these are the ones I'm totally comfortable with. However, at 75 or 76, I load Kick's horde LK questing profile and afk that. Don't take that as the bible to afk questing profiles. However, with an unstuck addon, it can't be beat from 75-80, IMO. And please note: I always queue as dps. If I'm on a healing toon, I still do DPS. Unless you have a bad CC, you have much less people talk to you and need less attention.
Taking on consideration the queue times for a DPS class, do you think this method will be faster than using BG BOT?