Of course the amount of insects drastically reduced, but for the windscreen there is another thing to take into account: Cars today are extremely aerodynamic. Even new Jeeps and the F150s are aerodynamic. Because of this, the insects are pushed away from your windscreen instead of against it, which is one of the main reasons why your windscreen isn't full of insects anymore.
The only real exception to this is the Mercedes G-Class, but I doubt that a lot of us will ever sit in one
Edit: apparently I'm wrong: https://feddit.de/comment/8318194