In this expansion, my endgame is not really an endgame. I keep getting characters to 90 and then turning around and leveling up another character. The most I've done at max level is to hang out with the Tillers and farm a bit.
I pet battle a lot, but I do that on leveling characters so that they can get the XP. Unfortunately, that means that I have extremely poorly geared characters when I decide to change things up and start questing again. Pet battles + Archaeology + gathering = leveling without getting any useful equipment. Happily, the Cataclysm gear vendors introduced in 5.3 have helped me when I get a character to level 80.