If you're playing a Horde character with their hearthstone set in Shattrath City, this can save you some time.
The usual way to get to Vengeance Landing is to take the portal to the Undercity, exit it, and grab the zeppelin from there. But you can take the portal to Silvermoon City, use the translocation orb there, and end up in the UC's upper courtyard having saved a significant chunk of in-city spiraling around.
Thanks to my guildmate Nyo for having noticed this. Playing Castlevania seems to sharpen her routing instincts. :)