Something else I have also done, once I got the garrison up and running, did all the treasures in that zone plus the zone world quests. At that point I had hit 94 - 95. Then I moved to Gorgrond and did all the world quests there and a handful of the questline for that area and by then I was between 98 - 100 on the team. I then picked up the Legion quest and skipped all the intro pieces which takes you to Dalaran. I have flying in the Broken Isles unlocked and so from there is was a simple Legion invasion farm all the way to 111.
I do have all the main Heirlooms which also gave me a nice boost too, but with the above approach I leveled all my slots up to 111 and I am now working through leveling them up to 120.
I hope this helps