Some may have used my profile of this for Glider a few months back and it seemed to have worked pretty well for most people.
I'm returning this small guide to you guys and hopefully it will work just as well as it did.
Starting Area: Borean Tundra; Fizzcrank Airstrip/Taunka'Le Village
Time to complete single route: 20/20/10 minutes (depending on adds/players)
Stacks/HR: ~15-25
NOTE: This area is mainly unknown to a lot of people. Don't expect much PvP besides the occasional questing horde/alliance player. Fire Leaves spawn very quickly and it's very rare to experience a "drought" while following these routes. You can also pick up fire seeds in addition to the herb itself.
(May take longer w/o epic flyer)
Route:
Enjoy!