Auto dismounts when the error messages "You are mounted." triggers.
This can be very helpful for quests and other things where you would normally have to dismount manually.
It has a check to not dismount you if you are flying or targeted by one of this ground effects:
Fleet Winds (Jade Forest),
Gross! (Valley of the Four Winds),
Consuming Rune (Krasarang Wilds),
Overcome by Anger (Kun'Lai),
Wild Energy (Isle of Thunder),
Lightning Strike (Isle of Thunder)!
Blanche's Elixir of Replenishment (A Brewing Storm Szenario)