Yup. A good 50% of players at $25NL do this.

There are a few decent players, say 1 in 20 at this level, who makes big bets WITHOUT HAVING A HAND. They usually take it down, thanks to the mentality of the 50% above. So my rule (and one I am *terrible* at sticking to) is that if a player at $25NL - one I have not identified as a big bluffer - raises strongly to an even moderately dangerous card, THEY ARE NOT BLUFFING. They have trips, a flush, a straight, full house or quads, maybe occasionally two pair at a push.

Believe me, the 5-10% of the time you're wrong and they're bluffing will be negligible compared to the amount of cash you're throwing away if you call/push each time.

(of course, if you have the nuts, then enjoy the inevitable de-stacking)