[Glurfle]

I would add to the other replies that playing your sets and other big hands fast on the flop gives you some cover for the other hands you might raise on the flop (various pairs, draws, and whatnot). If I know that your flop raise means you have no better than top pair since you're going to slowplay your sets, then I also know that I've got a pretty good chance of check-raising you on the turn with something like bottom two pair.