It seems like a really tight play to me to fold a set of queens. I think Demiparadigm was right about the odds being with you completely in this situation. I geuss there are a few signs that may suggest a beat by a higher kicker, like a raise before the flop or being up against and INCREDIBLY tight player. But a bluff or even a bet on the second pair seems more likely. If your not going to play this hand, your going to be waiting for a long time to pick up any pots and most players will probably get an easy read on you for being extremely conservative.