I agree about putting the money in PF, you have to really know your opponents to play AA post-flop.
Yeah AA is theoritically 33% against a full table pre-flop. But if you are not getting your money in PF, you risk gettnig most of you money is as big dog.
What do you do on a flop on a flop of

and there is a bunch of action - what are you up against? A9 JJ and KTc? or A9c 77 and 68?
Limp reraising with AA is something I only use.
1. UTG
a. early in a tournamet
b. in a loose NL game
c. late in a tournament if I am willing to take a risk to bust someone.
Last time I did that flop was 854, one guy had 88 one had 44 and one had QQ and the river was a Q. Oh yeah, and no one raised PF.