Wow, it's nice to know I'm not the only over-packer! But I've actually gotten better over the years. I now lay out all of the clothes I want to take, then make myself put half of them back. I always, always do laundry mid-trip, so I don't need nearly as many clothes!
Actually, on my last trip, the unthinkable happened. I looked at the long-range forecast right before I left, and packed accordingly. It was October, 2009, and they were predicting near-record high temperatures (mid-90s for the first week of my trip). So I packed mostly shorts, sleeveless tops, and sandals. Had only one pair of long pants, one pair of sneakers, one sweatshirt, and no warm socks. Well, about 10 days into my trip, the temperatures dropped dramatically. We're talking mid-60s and very windy, approaching record-cold temps for October! Man, I sure wish I'd had some warm socks, a warm jacket, and gloves! That wind coming off the lake at Epcot was cold! I had on my long yoga pants, but my legs were still really cold. Spent considerable time looking in all of the shops @ Epcot for some warm socks; finally found some in Japan, but they were the funny kind you wear with Japanese flip-flop-type shoes. I was glad to pay $10 for them, though, because they covered part of my legs!!!
So that just goes to show you, you never know what you'll need in Florida!