A few years ago, I was fond of taking visitors on helicopter tours of SF. There was a particular pilot I flew with many times. You get to fly low over the city, through the spans of the Golden Gate Bridge, under the bridge... It's incredible.
Apparently it takes a zillion hours of flying to be licensed to fly where they do.
He said that in all his years of flying, he felt in control of the variables until the age of drones. He believed that if a drone struck his tail rotor, that had the potential to bring him down. The drones fly everywhere he does and at his altitude, so the only thing to do was fly slowly, watch like a hawk and hope.