Love bugs are not mosquitoes, they are flies, and they do not bite or sting; if they land on you they just tickle. They are a problem squished on painted surfaces like cars, b/c chemicals from the corpses damage the paint. If we drive our own vehicles in the South during love-bug season, we coat the car with unbuffed paste wax to protect the paint.
Real mosquitoes are an entirely different story, though I've never had any trouble with them in the theme parks. Disney sprays outdoor areas very heavily for the most part, but I have encountered the little nasties in wooded areas, especially at the resorts. (They spray using truck foggers, they are all over the World at about 3 am.)