Yes, I collect them. I have a bunch of old family movies, from the 1920s-1960s. It's cool to see the old cars, people, houses. Those are from my own family though, I don't think I'd seek out other people's old home movies, it's boring enough watching the ones I have
But lately I've been collecting feature movies too, and shorts, and documentaries. Have around 100 reels, including about ten feature length movies.
16mm movie collecting is fun, rewarding, frustrating, and also quite expensive.
And yes, old kodachrome home movies have amazing colour. And Technicolor looks great too. Eastman is mostly badly faded though.
Making home movies on 16mm was a huge production, you needed someone to operate the camera, and a second person to operate the sound equipment. Most cameras don't have a big capacity either, and if you mess it up you don't know until its back from the developer. 8mm was way more affordable and common for home movies, 16mm was a hobby.
16mm was used commonly to shoot TV shows and lower budget movies, and still is used today although much less than say 10 years ago. It would be very rare to find a 16mm home movie from after 1970 or so though, and even more so after the whole video revolution.