After various searching nothing came up along these lines...
When you use the teleporter in Strand of the Ancients to port behind your base's walls, you get a temporary debuff called "teleport" that prevents you from teleporting a second time for 20 seconds.
Teleport - Spell - World of Warcraft
I realize this isn't blowing the lid off the exploit section, but every little bit helps, I'm sure:
Paladin's Divine Aura (bubble) and Blessing of Protection will remove the debuff. I imagine mage's ice block would do the same, as would any kind of invulnerability-generating spell.
For folks running up the hill trying to pass through several doors and finding themselves waiting outside the second portal for 5-10 seconds, this may be slightly useful? Who knows.
-Ast