I'm still playing on Arathor (and Ragnaros every now and then), as is a lot of people from Hexus Horde. My Mage is now 58 and enjoying end game instances and PvP (especially the new AB) but as always I just don't have the time or energy to level up or play enough to get a decent PvP rank. It's a shame really, I'm not really crap at PvE or PvP but unless I plough hours into Kerilus all the time I never will.
Still, having fun with my alts and that's keeping me going I think.
If cars had followed the same developmental path as computers, a Rolls Royce would cost £60, get a million miles per gallon and explode once a year, killing everyone inside.