I used the search function and found nothing about it, so I discovered years ago (most mages will know it already I think) that you can blink easily in the tree at 58.6, 42.4 in Orgrimmar.
Map + Coords:
1. You can start here to blink, but you can do it at every other position around the tree too.
2. Blink!
3. Voila!
I think it's useful if you are a Alliance Mage. You can easily Blink in and regenerate HP/Mana if you have some problems with the other Faction.
Hafe fun! :wave: