A lot of people may know this already, but if you choose the Siege Engine building in Nagrand, you can faceroll all the quests. Simply queue for a 2v2 skirmish arena, finish it and your 10 min CD will be reset. I took about 1 hour to get from 98 to 100 this way.
So to make everything clear:
1. Go to Nagrand at 98.
2. Start doing the quests up until you build your Nagrand garrison building.
3. Choose the Siegeworks one.
4. Spawn the Siege Engine, faceroll the quests ezpz.
5. When the Siege Engine dies, queue for a 2v2 skirmish arena and enter it, then finish it so you don't get the debuff.
6. Your CD will be reset and you will be able to rush more quests.