Personally, I find treemaps unmatched for disk space analysis. Specifically, I like to use the squarify layout algorithm, to NOT use the "cushion gradient" shading method, to use inset frames to convey depth visually, and to include filenames. This maximizes glanceable information density, for the use case of identifying large objects to delete to recover space.

This is how the old spacemonger app worked, and I liked it so much I had to recreate it for Linux/Mac: https://github.com/alanbernstein/treemonger. My version still needs some work, but it's minimally useable.

Treemaps are also good for profiling (see KCachegrind), they waste a lot less space than flamegraphs and the area-relationship is relatively well maintained.