As a real pilot with quite some hours, in real life GA you avoid any other plane as much as you can.
Car on highway at 5000 feat AGL look static at some point.
The only time you see moving vehicle, it's in the circuit-landing-take off. And you don't have time to look at those at all.
When joining a circuit (controlled airport), let's say your #5, you will be ask to identify the #4 airplane in front of you (in general) and keep your distance from him.
So there is not much time to look around for sight seeing. Your eyes will keep looking at the instrument and your surrounding each few second.
At night, I agree, it's a different story.
So a bit of GA traffic would be nice.