Hello,
I noticed today while questing in Dragonblight that you can trick the fast respawn rate of a mob in Icemist Village to gain experience faster than usual.
You will find the mob you need únder Icemist Village.
He is called Anok'ra The Manipulator (needed for quest Chains of the Anub'ar) and can spawn up to three times in a row, while you are there!
This, combined with his low respawn timer, can yield large ammounts of experience for a fairly low effort.
He should be worth around 900 experience per kill.
Enjoy!