We spent not quite 2 weeks there including Columbus Day weekend. It definitely got more crowded on the weekend and the holiday. It was still managable, but not as nice as the previous week - or days following Columbus Day.
Next year, our plans are to go at that same time (my dds' b-days are on the 7th and 15th). To avoid the crowds, we plan to take a trip to Ft. Lauderdale over the weekend instead of staying on site. (Our two other reasons: We have relatives there and going away on the weekend makes our DVC points go farther.)
Unless I'm mistaken, someone mentioned that the Food and Wine Fest. is starting earlier in Oct. next year. It hadn't started by the time we left last year, so I don't know how that impacts the crowds.