Why do you all assume that just because people looked like idiots in wow that it will be bad?
Nobody complains about jumping in EQ2 or EQ1 or LOTRO or DDO because they don't make it "cool" to jump.

In WoW everyone jumps and dances everywhere because they stylized it. Nobody spammed it in EQ2 because the animations looked stupid, but it was still very useful, Especially in boss encounters where they had floating platforms and random teleports.

Think about the potential jump could have in bad-assery.
Earth-based mob uses Quake, players Jump.
Deadly encounter with a 2-inch hill that makes you run around halfway around the map, players jump.

Adding a system for jumping could add them to allow a lot more features in the future, such as swimming. This is an MMO, a beautiful MMO with lots of room for social interactions and roleplaying and just chilling out. It's a video game.... and maybe you just want to jump in the lake with your friends who don't live in the same city as you and just BS with each other.

Jumping isn't evil, WoW making it cooler to jump around town than actually play the game is.