More info... Integrated Pest Management. A program where Disney releases 250,000 beneficial insects onto the property each year. Their mission? To control harmful insects by doing what comes naturally -- they gobble them up.
Disney World is a nature preserve so they do this very often. My husband marvels (no pun intended) at how he can come home with no bites when mosquitoes just eat him up everywhere else.
However, to the OP, if taking spray will make you feel better, then do so. Although I would advise a lotion of some sort.