Since the late 50’s, almost all military bases in Russia and the US (and I would assume in China and other Western countries as well) have been constructed and upgraded with “satellite cover”, meaning that pretty much anything important happens underground, in massive uniform warehouses, massive covered hangers, discrete buildings that are oftentimes featureless and identical, and in covered train terminals (many of which are also underground).

Military bases often use lots of foliage and trees to cover roads, walking paths, and doorways.

Spy satellites have already been countered in the way you are thinking.