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Suppose there were only 8000 cars in the world, evenly spread all over it (I'm being generous here, since 2/3 of Earth is covered by water). How likely would you be to ever see one?

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The starlink satellites are traveling a little bit faster than your average car though. They complete an orbit about every 100 minutes. So your 8000 satalites are covering much more ground than the same 8000 cars.

At any given moment the distribution is similar, and we track and regulate the orbits, leaving swathes of space open. Everything about the satellites is engineered, including their orbits. Other countries have less stringent standards, resulting in more or less random de-orbits that can drop space junk anywhere in their path, but the US has a lot of forethought put into orbital standards.

Space junk is an issue, but it's not anywhere near crisis level yet.

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