I filled up the exp gaps by doing instances.

Basicly, I start Hellfire peninsula at 60, I get to 61 and a bit. I grind some instances upto 62.
I start Zangar at 62, get 63ish, Do an SP+UB questrun, maybe more instances if needed, until 64.

Then I do Terokkar, all quests. And after, more instances upto 66.

At 66 I did a Durnholde first for the quest, then started to quest in nagrand.

This is where I am now. 66 and 60% of a level.

I expect Nagrand to take me -well- into 67, probably close to 68. Either way, I will do the auchenai and setthek quests after nagrand, and then do Blade's Edge. Which should get me into 69, at which point I will do some SL to get my lower city honored and at least one BM run for the quest. I should have all factions honored and the Seer's Mail Battlegear in my bags before I ding 70, If I am not 70 by this point, I'll likely do a SP heroic with a good tank. (With 4x Totem of Wrath, this shouldn't be a problem for me at 69. ) Maybe the daily heroic at that time if I think I can do that heroic as well. And mess about a bit in shadowmoon and netherstorm.

That's my plan anyhow at this moment. I just try to fit in instances to and dont start a zone at a lower level then i want to start it.