Thats about right for putting out the gear (6-7). Usually its put out when starting down the glide slope but traffic, weather and and the crews position compared to a normal profile would make variations in the gear extension point.
I think not. As I fly 1,000 feet AGL around my neighborhood, I sometimes notice people as I look out. One time I did a steep turn over my house which required adding power for the maneuver, and I noticed people below looking up. But when I fly at 2,500 - 3,500 feet I barely notice cars.