That's not what he's saying. He's saying that those who want to experience things...don't. People drive from far away probably just to stay there for a few seconds and call it a day, while sitting in their car. Probably take a selfie and say they were there to experience the cuckoos...but really didn't. That's why he's sad for them.
That’s not what he saying either. He’s saying that cuckoos don’t care if you watch them, because the sounds they make aren’t for those people who pass by. The cuckoos are for cuckoos and he is a sad one indeed.