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So I sort of stumbled on this by mistake a minute ago; it's fairly obvious and probably already used, but I thought I'd share.
Like many of you (probably), my HS is set to Shattrath city. Why? Because of those lovely portals to the other side of the Cosmic Map. Only problem is, waiting for that dreaded HS cooldown when you're stuck in Azeroth, and want to get back to Outland.
Here's what to do:
In Shattrath, join a PvP match, anything that usually has people instantly signing up (something like AV where people are always doing it). Now, use one of those portals to go to Azeroth, and check the AH or whatever it is you want to do.
You'll probably get the "enter battle now" message swiftly after your arrival. Enter it... then immediately "/afk" out, and you're back in Shattrath city - the place you signed up for the PvP.
Of course, this would work the opposite way if for instance you had your HS to Shattrath, and were in Azeroth, wanting to quickly go to Outland and back (just sign up for the PvP match in Orgrimmar, instead).
Of course, once you have used this method you get the dreaded DESERTER BUFF :O... but after 15 minutes you can use this technique again
I hope that this has been written well enough for people to understand, and I hope someone makes use of this. Thanks.