I stopped playing WoW before Wrath of the Lich King came out, so when I first heard that Cataclysm was coming I renewed my subscription, rolled a death knight and specifically went back and did everything that it's possible to do in Azeroth. I visited all the regions did all the quests, farmed the instances, visited the battlegrounds and got the achievements just so that I could see the world one last time.
Of course I then continued to level to end game and found that crafting has become pointless, the skill required has gone out of playing instances as a group and you have to spend over an hour just getting all of your dailies done before you can start doing anything interesting, so I quit again. (and no you can't have my stuff)