The main differences is that drones are not restricted to National Air Space, don't require an airport nor ATC nor an air worthiness certification nor an operator's license. Low altitude sensors on an electrically powered quadcopter are a reality, peeping through a window near you.

The only protection citizens have (of which I am aware) was a Supreme Court decision that ruled thermal imaging was an invasion of privacy and required a warrant. The field of remote sensing is changing so rapidly that we will see that decision revisited many times.

Also, what's to prevent some ********* with a grudge, a crook, or a perversion from using UAS for whatever surveillance or whatnot she may wish to pursue?

I'm with the folks up above -- fly that mofo over my land and meet Mr Remington DCCCLXX.