So sure, munching through all of the quests of Jade Forest/Krasarang/Four Winds before moving on will definitely push you along, and make it seem like you didn't need to do as much in Kunlain/Townlong/Dreadwastes, you will go faster by moving to the next higher zone as soon as possible, since the quests take roughly the same amount of time but yield significantly more XP per turn in.
Hit level 86:
Krasarang or Four Winds avg quest turn in = 129k xp (before bonuses)
Hit level 87:
Kunlai Summit avg quest turn in = 162k xp (before bonuses)
Hit level 88:
Townlong Steppes avg quest turn in = 196k xp (before bonuses)
Hit level 89:
Dread Waste avg quest turn in = 236k xp (before bonuses)
The other thing is by starting Dreadwaste at 89 and doing all of those quests, if you have the commendation, you will be something like ~15k/21k towards exalted with Klaxxi, which will net you a free 489 ring and access to 463 weapons you can purchase for gold to help boost a fresh 90. Only a few days of dailies would be required to finish capping exalted at that point.