You too, rather than running WinDirStat regularly.
Folder sizes are really only useful if you are trying to find something that is using up a lot of wasted space.
You'll not believe it, but this is exactly what I need.
If you are using it to find out what files are using up space, use WinDirStat, it not only tells you where the large files are but also lets you know what the file types are. I would not want my folder list to be different sizes at all, will make navigation and readability a giant mess. Last thing I need to to get out a ruler and check if this folder is .3 mm wider than another one.
There is always "sort by size" option.