I have used WinDirStat for years. It's not perfect, but it solves my use case very well.

My use case is just: my disk is full, I don't know why. This happens on one of my computers like once a year, so the fact that it's slow is fine. It usually helps me spot some folder set that is taking up a lot of space that I don't need on that PC, or something large that is duplicated.

My personal favorite example is wedding photos and videos. Turns out: those are huge, I am not going to delete them, but they don't need to be backed up on every computer I own.