I use the old Space Monger. It is pretty basic visual representation of your dive contents. Along the line of WinDirStat it shows the space taken up by a folder or file's contents.!. I like it over WinDirStat because it labels the shapes so you can see very quickly what folders and files take up the most space. It is a bit slow to index when you first open, but reloading after changes, even on my terabyte network shares is almost instantaneous.

The interface is simple and to the point, with no extraneous gimmicks. Also there is no install all you need is the exe and you are good to go.