Looking at the probability of encountering other satellites, if you could wander around up there at random ....

Radius of Earth = 6378km, Orbital height of ISS = 408km, Total radius of a sphere at this height = 6786km (R)

Surface area of a sphere at ISS height = 4*pi*R squared = 578,385,438 sq km

No of operational & defunct satellites = approx 3700

Therefore;

Average area for each satellite (assuming all at ISS height) = 156,320 square km, or a square of almost 400km side length, IF they were all at this height.

But they're not. Height differences between orbits can be hundreds of km. The SpaceX Falcon Heavy Tesla went out to around 6,950km before leaving Earth orbit

Even if we assume them all at the same height with an average size of 5 metres on each side, then each is a target of 0.025 sq km within that 156,320 square km ...... or 0.000016% of the available space. Not surprisingly, they are easy to miss.

Space is big. Really big.