Hey, I know what you mean when there is super long hair but it's not the intended center of attention, unlike 99% of hair-related vids.

Unfortunately the overwhelming majority of modern Hollywood movies don't have that. But if you look at past movies or movies/shows from other countries, you could find long hair being commonplace or even super long hair down to the knees in some instances. Here are a few off the top of my head:

Hawaii Five-O - American movie with thigh-length hair

Nil Nethu and Pini Bindu - both Sri Lankan shows with knee+ length hair

This Sri Lankan movie with ankle-length hair:

I'm sure there's plenty others from India and China as well