Thanks for the laugh! When I performed in SpectroMagic we would stage the parade on the road behind Jungle Cruise about 45 minutes before step-off. We used Deep Woods Off, and even then I would come out positively covered in mosquito bites every night! Those little bugs were the bane of my existence! I must admit, I about spit tea all over the moniter when I read that!
So, the answer to your question is there are mosquitos in WDW, they're just too busy eating the tasty characters to care about the guests!