Breakfast Topic: What's your favorite aspect of WoW?

There's a reason we all play. Some of us enjoy PvE and some of us prefer PvP. Some of us like questing, some of us like grinding. Some prefer 5-player groups and others think anything less than a 40-player raid isn't sufficient. Some of us cry out for outdoor PvP while others enjoy battlegrounds or the dueling grounds outside of Ironforge. So this morning I ask you — what's your favorite aspect of WoW? What type of gameplay keeps you coming back for more?