Well, I'd heard that with 5.3 Blizztards had increased the rate of levelling.
Well I am here to testify (well actually I'm in Jade Forest but let's not quibble) that it is true.
I have 9 months rested experience (shame that doesn't keep stacking past 2 weeks or whatever) and am now a few bars into level 87 and still running on rested XP!
Not only that but, as I stated above, I'm still questing in Jade Forest - Wowzers!!!
In other news, still wearing a couple of epics but a lot went in the first sort out!