Even in microstakes I always raise PF my premium hands. Often times this scares everyone off, leaving me with a whopping 6 cents from the blinds, but sometimes I'll get a caller who'll fold to a c-bet or will bet their K to the river when im holding AA. Now, I could be passive, and slowplay them, but my reading skills and postflop play isnt perfect. AA is a very very hard hand to laydown, if you've shown strength and someone is raising you postflop, you have a lot more information to use, and thus it's easier to know if you're beat or not.