As a central Florida native I have little doubt that the landscape architecture plays a big role. Mosquitoes breed and multiply incredibly quick in this climate. Every city sprays regularly to keep populations lower, but they are still around.
In the Midwest, those suckers eat you alive. No body of water or pool in sight, but summer nights you wouldn't go out without bathing in Off.
>I went boating in the Everglades in August last year for 3 days and I haven't seen a mosquito. Not even one.
The unspoiled Everglades had tons of mosquitos.
Before they built Disney World that was a hell of a place to get a flat tire on the turnpike.
Day or night it was just as bad as the Everglades, and if you didn't have loads of repellent more mosquitos would be circling for a landing spot than there was room for on any bare skin.
Most likely almost all of the tonnage that was applied by all parties, of the most effective pesticides available, were dispersed in the area in the decades since.
With the much larger human population today still using ordinary toxic stuff widely on their homes and lawns, maybe this helps make it easier to use non-toxic pest control within the tourist attractions.
They were ubiquitous in the North during the summer when I was growing up but around here they seem to have been all but eliminated, at least in the populated areas.
Now other bugs are everywhere around here. It took a big adjustment to get used to just how many insects there were everywhere and how quickly they'll take hold without proper precautions.
In my experience ticks are a much bigger pest, especially if you like hiking.