So this is the easiest way to make a file / folder list of an entire drive(?):
When I select a drive (or more) in the folder panel, press CTRL+S and save the efu file, then I have all of the items of a drive (or more) in the list without a single file / folder missing?
And to save a list of ALL of the volumes / indexes / ALL of the files and folders one need to set the search filter to "Everything" and press CTRL+S?
I think the answer would be that it's personal preference. There are couple ways, and you nees to test and choose the way that is preferred and convenient for you, what suits your needs better.
You can have the output via the GUI and you can also have it via a CMD or a batch file.