Even if you are from Florida, how you react to cooler weather is dependent on your normal body thermostat. The day you posted this thread I was in a woodland festival, temps in the mid 40's with a 10 mph breeze, a fine mist coming down and it was very overcast. Looking around, there were people comfortable in jackets and others with coats, wool knit hats, scarves and gloves. Comfortable definitely varies by person!
I guess since you are not used to cooler weather, then think back to times when you are in the grocery store. Do you ever feel chilly? Supermarkets can sit between 55 and 60 degrees in the produce and frozen foods sections.
At the parks, you have to consider down-time for parades and outdoor shows like Fantasmic and WOC. The chill can really set in when one's butt is parked on concrete for over an hour. So 60 degrees walking around is warmer than 60 degrees sitting pretty still for a long time.
Oh, and Fantasmic can get misty near the rails. Ohhh, that is a chilly experience when temps are low!