What are you into? This expansion for casual play is far better than the last few imo. If you still like 5man dungeons you can get decent gear from m+ which is just a beefier mythic dungeon that gets harder the higher difficulty you go with better rewards. If I wasn't raiding with the FOH guild I'd honestly be super casual and just do a few m+ a week to satisfy my lust for gear.
If you like dailies (hey I'm sure there are dozens of us), world quests are also beefier dailies. You don't have to do them all, you can target specific rewards for the quests that are up at the moment like more AP or mats or possible gear.
Questing (not world quests) is the best it's ever been in my opinion, which I feel says a lot cause all WoD had going for it was the quests/leveling. The story is okay in most zones and you can finish the big big big quest chains in LFR if you get to that point.
Flying makes things easier which will take time but it's not that difficult to get.
Pet battles, mount collecting, transmog colllecting, professions that are actually useful is all in there.
As much shit as I give the game, there is always something to do when logging in vs logging in and staring at my garrison for 10 minutes and logging out.
Well, if it is still better than WoD even after all this time then I think I might just sub for a while. Not as if I'm doing anything better with my life lol!
So, another question, what sort of addons are all the cool kids running with these days?