> I’ve also used windirstat (I think that’s what it was called) years ago on Windows and Disk Inventory X on MacOS graphically.

On Windows, the new hotness is WizTree, which rather than recursively calling directory listing functions, it directly reads and parses the file tables itself. This makes it orders of magnitude faster. I have a 2 TB hard drive full of a million files, and WizTree reads and parses it all in under a minute, whereas I can expect WinDirStat to take half an hour.