Spirit Walk is a great reason to go Rt/A. Also Item Spells work quite nicely with it to. For example.
-Cast Daoshen ashes.
-Run into the centre of a mob and cast Spirit Rift, then Ancestors Rage, followed by Tsungrai ashes, (this should make you automatically drop Daoshen).
-Stay in the mob for as long as you like, cast some more spells or something (Destruction perhaps) however, by that time, you might just want out of there.
As soon as the heat get's too much, Spirit Walk to an allied spirit, created ( by you) just outside of the aggro bubble (spell range). On porting' you will automatically drop your ashes, givng you a nice fat heal upon getting to safety.
The ashes thing should still work. As in they drop after porting. This might have been changed with an update. I know you can't use Ride The Lightning to drop bombs on the enemy, as you drop it before you port. Another elite that is worse than a normal skill. Thanks Anet.
It can also assist your kiting from angry warriors. Run in one direction, then pop back to your spirit

. Continue every 8 seconds. Siphon Speed can aslo be quite good. Not many warriors bring hex removal.
I'm sure there's more.