Greetings,
I haven't contributed for a while but bumped on this while leveling my Monk. NOTE: This is only for lazy people.
Basically:
Once you're done with Tanaan Forest you go to Shadowmoon Valley, and even before you establish your Garrison you get the quest [90] Ravenous Ravens.
While on it you will notice a nest with a Lunarfall Matriarch nearby:
You need to go in the nest and just keep AoEing while the little birds respawn:
I got about 280 k XP in less than 10 minutes by just keeping Rushing Jade Wind up at level 90.
At level 91 the XP dimished obviously, but it's still not a terrible way to farm XP while semi-AFK.
What I also noticed is that at some point they randomly stop respawning for a short while.
Overall, not an amazing find but worth sharing I thought.
Have fun!
EDIT: 15 minutes = 250 k experience so far on level 91. That's Rested and with 15% Banner though.