Well, unlike spl, I don't see anything wrong with your "attitude." In my opinion there is a HUGE difference. I much prefer low season as there is a discernable difference in the number of people on the streets, there are fewer people at the pools at Banana Beach, restaurants don't ever have wait times, on and on and on. I've now been a couple of times during high season and don't think I'll be repeating the experience any time soon. Plus the hotel rates are considerably better durring the off season. But, that's all just my opinion.
September is still my favorite time to go.