I am looking for a command line file explorer/manager that displays the folder size. I am aware of GNU Midnight Commander, Last File Manager and vifm but none of them display the folder sizes (edit as corrected in xaizek's answer: they do but you need to hit a keyboard shortcut for each directory). I am also aware of the command
du but it's a pain to browse folders and having to
du each time.
E.g. on Windows, using Explorer++, there is an option to automatically display the folder sizes: