i personally like CLI because just a few key strokes and i will get what i need. But i am bad at remembering the optiosn and commands... so this will be a note-to-self post, while hopefully it might also be helpful to you
to see folder size, the simplest way i know is to use du:
wahlau@localhost:~/ $ du
and you will get a long list of folders and the number of kilobytes of the data in the folders. so make it more "readable", just do this:
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