I have my parents and siblings on my iCloud family with 1tb and we have yet to use 60% of the total space. This is with backups turned on and photos as well. I think it is worth the money.
The ios 13 features and even ios 12 show that Apple has continually made sharing and photo streams better. I think it is worth it and you can even share photo streams via urls to people that don't have ios. _I know multiple platforms have this already, just pointing out that Apple is really interested in making this experience a good one_
