I've noticed that using Warlock's Demonic Gateway now works almost everywhere in the world where you want to climb mountains or etc. This can save a lot of time in places where you normally can't walk up easily. I'm not sure if it's intented but I think before BfA it was much more limited how you could use the gateway. Also by using Eye of Kilrogg you can sometimes move the camera to better location before casting the gateway. In best cases you can climb 60 yards directly upwards.
I know some people have already found good uses for gateway in dungeons too, anyway this can be quite helpful also while doing world quests or leveling.