In the future this is what I have found to be the best way to level through WoD. I've done it so many times it only takes me about 2 hours with Garrison Potions + Full Heirlooms to go from 90-98:
(Horde Side)
Do the intro questline to build your garrison and get to the point where you rescue Olin Umberhide, use HandyNotes to pickup all treasures/garrison resources you see along the way, do the 3 FF Ridge Bonus Objectives. This should get you close to 92. Once you have 100 Garrison Resources buy
this experience potion. As soon as you hit 92 you go straight to Gorgrond, do the intro to open up the first town and then:
1) If you don't have 100 Garrison resources or need another potion get the
Iron Horde Weapon Cache for 100 resources.
2) Do all the Bonus Objectives
3) Kill all the Elites that are part of the
Gorgrond Monster Hunter achievement. They all drop quest items for a hefty amount of experience.
4) Remember to keep picking up all treasures and garrison resources you find
5) Once that is done in Gorgrond go to Talador. If you need another potion get
The Amethyl Crystal for another 100 resources
6) Go to Voljin's Pride in Talador and get the quest to unlock the dude in the cage. Then do his short questline to get to choose which outpost you want which opens up another Bonus Objective
7) Do all the Bonus Objectives in Talador
8) If you aren't 98 yet go to Spires of Arak and do all the Bonus Objectives there, at this point you should definitely be 98 and get your Artifact Weapon and go to Broken Isles.