Has anybody used the Google Earth Extension to view Satellites in Orbit?

I would think that Google Earth has cleaned up any FO in picutures. Also, Google Earth is not a real time view of the US. If you look at say Denver Colorado right now, all the trees and lawns are green and there's not a could in the sky.

In terms of items in orbit, USSCOM (US Space Command, formally NORAD) keeps track of something like 11 million objects in NEO (near earth orbit) if I recall correctly. Satellites are constantly adjusted to avoid collisions. The Chinese did nothing to help this by blowing up one of their satellites which increased debris by a huge number. Yes, they have different altitudes and there is a difference between geosynchronous orbit (com sats like PANAM and Intelsat) and those that orbit the earth every few hours. You can actually see them on a clear night. Just look for a small spec of light moving in a straight line very fast. It will look different than a plane.

Yes, there have been close calls.