Well it does give your hand away somewhat... but about half the people out there won't even notice this. Fast betting looks as if you have something and you really want to defend it. It didn't really matter in this hand since he probrably called you down with a worse ace or queen. You probrably got the maximum out of that guy.

Fast betting however can also mean a bluff if you keep betting in disregard for what cards come on the board.