I got 90-100 in about 6 hours total. I played 90-100 on beta a few times and did experience the content - which i recommend to do - if you haven't played it before. It's great!
24/25 dailiy quests from Shadopan, Klaxxi, and Isle of Thunder got me 45% into level 90 before I stepped foot into draenor.
Main Point #1:
Bonus Objectives are the most important thing you can be doing.
http://www.ultimatewowguide.com/blog.../09/bonus2.jpg
Main Point #2:
You should be questing and picking up rare treasures along the way. Some of them gives 15k EXP, noted with coordinates below.
WoW 6.0: Warlords of Draenor - Treasure Chest Locations of All Zones - World Of Warcraft: Warlords Of Draenor - news,hub - 2P.com
also spent my garrison upgrades on 20% potion:
Excess Potion of Accelerated Learning - Item - World of Warcraft
Excess Potion of Accelerated Learning
Item Level 1
Binds when picked up
Use: Experience gained from killing monsters and completing quests increased by 20%. Lasts 1 hour.
Requires Level 91
RULE OF THUMB:
1. DO EVERY BONUS OBJECTIVE YOU CAN DO BEFORE DOING QUESTS. THEY GIVE 70-100k EXP PER OBJECTIVE AND TAKE LESS THAN 5 MINUTES TO DO.
2. ALWAYS HAVE A 20% EXP BUFF POTION ON.
3. CHANGE ZONES AT 92/94/96/98 EVEN IF YOU AREN'T DONE/MID QUEST.
4. IN SPIRES OF ARAK, MAKE SURE YOU CHOOSE THE GARRISON THAT GIVES 20% ZONEWIDE EXP BUFF
5. IN NAGRAND, MAKE SURE YOU CHOOSE THE GARRISON THAT GIVES THE MOUNT FOR COMBAT (YOU CAN CAST/ATTACK/QUEST WHILE MOUNTED)
6. PICK UP THESE HIDDEN ITEMS. THEY GIVE YOU A QUEST REWARDS EXP AND GARRISON RESOURCES. TOM TOM COORDINATES FOR TREASURES TO FOLLOW:
You should use TomTom and Paste Addons to help you:
TomTom - Map & Minimap - World of Warcraft Addons - Curse
Paste - Chat & Communication - World of Warcraft Addons - Curse
SHADOWMOON VALLEY:
--before garrison
/way 30.2 19.9
--in garrison
/way 48.6 59 --banner
/way 49.3 77.2
/way 50.7 48.4
/way 42.1 54.6
/way 31 27.7
--NW of garrison
/way 28.8 7.2
/way 27.1 2.5
/way 26.5 5.7
--1st bonus objective
/way 22.9 33.8
--leave garrison
/way 37.2 26
/way 37.2 23.1
/way 41.4 27.9
--cave
/way 47.1 46
/way 48.7 47.5
--2nd bonus objective
/way 45.2 60.5
/way 44.5 59.1
/way 43.8 60.6
/way 44.5 63.6
/way 42.1 61.2
/way 34.5 46.2
--anguish fortress
/way 38.5 43
/way 36.8 41.4
/way 37.8 44.2
/way 36.7 44.4
/way 36 40.9
/way 34.2 43.4
/way 33.5 39.7
/way 31.3 39.1
/way 28.3 39.3
/way 30 45.4
GORGROND:
/way 57.8 56
/way 56.8 57.3
/way 57 65.4
/way 52.5 67
/way 51.8 69.1
/way 51.7 72.2
/way 53.1 74.5
/way 53 80
/way 53 79
/way 49.6 78.9
/way 48 93.4
/way 46 93.6
/way 45.8 89.3
/way 51.8 61.5
/way 39.4 56.3
/way 42.3 54.8
/way 41.7 53
/way 47.2 51.8
/way 45.7 49.7
/way 48.9 47.3
/way 46.6 67.3
/way 36.7 51.7
/way 43.7 42.5
/way 42.9 43.5
/way 45 42.7
/way 46.3 43
/way 47.5 43.6
/way 49.3 43.6
/way 49 48.4
/way 50.1 53.8
TALADOR:
/way 78.2 14.7
/way 64.9 13.3
/way 58.1 12.1
/way 54 27.7
/way 52.6 29.5
/way 62.1 32.4
/way 75.8 44.7
/way 73.5 51.4
/way 77 49.9
/way 75.7 41.4
/way 81.8 34.9
/way 64.6 79.2
/way 65.5 88.6
/way 66.5 86.9
/way 46.9 91.2
/way 38.3 84.5
/way 33.3 76.8
/way 28.3 35
SPIRES OF ARAK:
--before inn is built
/way 36.8 17.2
--after inn is built
/way 40.6 55
/way 41.8 50.4
--ghostplace
/way 37.3 50.6
/way 36.5 57.8
/way 37.7 56.4
/way 36.2 54.4
--behind ghost palce
/way 37.2 47.4
/way 35.3 39.4
--after 2nd bonus objective
/way 33.3 27.3
/way 34.1 27.5
/way 43.2 27.2
/way 43.8 24.7
/way 42.2 21.7
/way 42.7 18.3
/way 43.9 15
/way 43 16.4
--pinchwhistle
/way 59.7 81.5
/way 60.9 84.6
/way 59.2 90.6
/way 55.5 90.9
/way 53.1 84.5
/way 63.6 67.4
/way 61 63.9
/way 58.7 60.3
/way 60.2 53.9
--mushroom stump
/way 56.3 45.3
/way 53.3 55.6
/way 51.9 49
/way 48.9 54.7
/way 48.3 52.6
/way 49 62.6
/way 51.9 64.6
/way 46 44.1
/way 49.2 37.2
/way 47.8 36.1
/way 46.9 34
/way 47.9 30.7
/way 50.7 28.7
/way 50.4 25.8
/way 50.5 22.1
/way 55.6 22.1
/way 54.3 32.5
/way 56.2 28.8
/way 67.4 39.9
/way 69.2 43.3
/way 71.6 48.6
NAGRAND:
/way 89.4 65.9
/way 67.6 59.8
/way 64.7 65.8
/way 62.6 67
--cat place
/way 72.7 61
/way 73 62.2
/way 75.8 62
/way 75.2 65
/way 75.2 65.7
--after cat place
/way 80.6 60.5
/way 82.3 56.6
/way 88.3 42.6
/way 89 33.1
/way 81.1 37.1
/way 77.3 28.1
/way 73.9 14.1
/way 73.1 21.5
/way 56.6 73
/way 55.3 68.2
/way 48.6 72.7
/way 44.7 67.6
/way 45.9 66.3
/way 48.1 60.1
/way 51.7 60.3
Thanks for reading :3