Like most things in poker its situational. Take a ten dollar tourney, UTG you get AA, first level. I'd raise the hell out of it. If it was a real loose table I might push right there.

Now, take the same tourney, eight levels later. You get AA UTG, you might min raise, you might 3x, hell I'd probably just call and hope a short stack after me would push to juice the pot, get a couple of callers then I'd come in over the top.

Take same situation, put you in BB. At first level if you don't raise on BB with AA you're a damned idiot. Whereas at eighth level you might just call a steal and get it heads up, then check and then go back over the top at the obligatory flop bet.