(root directory)
TV shows cartoon
Futurama
"Futurama Season 1" etc as zip files in store compression (to reduce the number of files)
This way everything is simple and intuitive and I can just copy/unzip whatever I want to watch. Or if I want to give stuff away to other people, I can retrieve and copy everything very quickly. I've been doing this for years and it's efficient without costing me a lot of my time.
What's in your archive that's 600+ TB?
Mine's tidy but not overly tidy. For example, I don't rename every file. I have a folder called "TV shows live action" and folders inside that are the name of the show and years aired. Every season is one zip file as store compression.
I think this is reasonable and cuts down on clutter. I used to obsessively rename files in the past and it wasn't worth the trouble.