I apologize if this has been said before but I do have a suggestion for SE:

Currently there are no places in the world where you feel like "Oh crap, I have to be careful traversing through here." Mounts can get by most things. Please bring back those wonderful lvl 99 mobs and make things more challenging for getting through a high level part of a zone. It made the game more fun and made you think about your routes before you blindly just ran into anything!!