The Disney spray fans were a huge flop for us last year. They leaked, our kids wanted to keep spraying themselves, and they were repeatedly tossed out of the stroller...total waste of $40! We did put the fan between their legs, but very little air seemed to make it to their faces. We ended up leaving them at the resort room after the second day.
BUT, the surprise favorite item for all of us was Frog Togg Chilly Towels! My toddlers LOVED them! I wet them every time we went to the restroom and/or did a diaper change. They aren't freezing cold, but they are much cooler than the FL temps and were worth the money spent! Don't buy white though. I did and they were filthy by the end of the trip. I chose white because I had heard they faded onto clothing. This year, I'm buying colored ones and washing them a time or two before we leave for our trip.