No Man's Sky

but do people really enjoy picking up ships, multi-tools, companions, and all that stuff that other people have found?

Yes. And there may be lots of reasons for it.

For example: you may be looking for a certain ship configuration that you like. Maybe that combination is rare (e.g., a shielded ball hauler aka a "glowball"), so you just aren't likely to stumble across it on your own. Or, maybe you do find one, but it has other configuration aspects you don't like (tail style, nose style, whatever). Or the colors are garish. At some point in your search for the ship that you want, you get frustrated, and start asking for help. The search has stopped being "fun". I've been there. Most of my ships are my own finds, but two are the result of this frustration, and seeking someone else's find on the Exchange.

Another example: you don't like certain ship styles (hauler, living, explorer, whatever), but someone posts a find and that particular configuration and color really jumps out at you. You didn't know you wanted that until you saw it. And you want specifically that. Now you go get it.

Yet another scenario: you want to build a base to share with others, and you want it on a planet with specific attributes. Color, biome, weather, general look and feel, etc. The base is the point, not the exact planet, though the planet's parameters still matter. Why delay the base build until you stumble across the right planet if someone has already found what you need?