I like Diskitude by Evan Wallace the most for this kind of quick and easy drive content sizes inspection.
It does full scan, but is pretty fast and easy to use. And is super tiny.
I was about to share this, I just told someone about it the other night, been using it well over a decade now without any issue, the same exe I downloaded in 2011 or so.
https://madebyevan.com/diskitude/