All in is a little drastic. I will bet it pretty tough though. you need to watch out because if I have those queens and you keep betting at me, I'll call the $6 flop bet then I'm going to crush you on the turn. But chances are, if I have QQ(can't say the same for everyone), you would have to make a pretty bad play on your part by calling my sizable pre-flop bet.
Also you are going to be drawing dead at that point because any 7 or 8 for you gives me a full boat higher than yours.