I am glad there is no flying, I hope it stays like this for the duration of the Xpack.
Obviously there is an influx of players with Legion, but I feel like it makes zones feel more alive. Ive had a lot of fun ganking and being ganked because players can't just fly away to escape PvP. There are plenty of flight paths and teleports I have no problem getting around quickly without flying. It seems to force you to interact with the whole world as opposed to just dropping down from the sky, doing your stuff, and then flying up and away again.