I've been in this same thread a few months back. Insect loss is definitely happening, but bear in mind your lack of splatter probably also has a lot to do with better aerodynamics of cars these days. Bugs blow over the windshield on modern cars, they don't tend to splat as often. I live in an area with swarms of insects and i never have to clean anything off these days.

EDIT: Out walking my kids while i write this and i just swallowed a bug :(