Wow. I have to call bs on this one. I did nearly every quest (106 of the 110) in Howling Fjord and got the achievement "I've Toured the Fjord" and went from 70-72 right in that zone. I did run UT Keep once to finish out those quests as well. Moving to borean tundra, I did about 1/2 the quests there and moved on to dragon blight @74, and once I hit 76, skipped right into Grizzly Hills. I'm currently half way through 76 and still have loads of quests left in Grizzly Hills. The only instances I've ran were UT Keep once, Nexus about 5 times, Ajol'Nerub once, half way through Ahn'kahet, skipped and moved on, and ran Drak'Tharon once last night.

For reference, I get about 250 XP / kill which is next to nothing. The real experience gain is from doing all the quests.

Here's my druids for reference:
http://www.wowarmory.com/character-s...Hakkar&n=Larrÿ

http://www.wowarmory.com/character-s...kar&n=Zappyzap