I got my Human DK to 90. He was the only one at 85 (because I never even finished the Cata zones). My Mage is like 82/83, and my BE DK is 80.
And I didn't actually play that much. But I have the guild exp buff, the anniversary exp buff, and managed to be more efficient with the time I did play than I usually do (largely do to my severe hatred of wasting procs, so Dark Succor needed to be used, dammit).
I finished the rest of Jade Forest, did Valley of the Four Winds, and Krasarang to completion. Haven't set foot in another zone yet, and was generally always in the dungeon queue.
Side note: What the hell, RNG? I've seen so much mail in the past two days, it's ridiculous. It's a solid 70% of what dropped in every dungeon. Then it's like 20% cloth, and the last 10% was leather (just a bit), plate mail, and shields.
I upgraded my head and neck in the first dungeon I ran, and that was it for drops that were even upgrades.
I don't really know what I'm doing next. My Druid is at level 70, so he can head to Northrend...