Good day, Richard, and welcome!
First of all, I wish you to keep as long as possible your autonomy, with the help of angels around you.
As for MusicBee:
* it does include a directory browser
* the auto-DJ feature can be left OFF
MusicBee can suit your needs, although it is rather focused on playing and browsing with the help of tags, thus the major part of the interface relates to tags and playlists...
In your case, the first (Windows) application that comes to my mind is XMPlay, which I used massively in the past for my audio collection.
XMPlay's interface is simple and comprises:
* a control panel (regular size, or mini-player)
* a list window with 3 states:
- library: all your files (with full file names), with columns you can select (see below)
- playlist: the now playing list, which you can easily redefine or adapt, save to / import from an external file
- information: about the current track
You can easily select tracks in the library and:
- add them to the playlist
- replace the playlist
Other interesting features:
* a queue
* a search window, which moreover allows you to skip non-matching tracks when playing
Possible columns of the library window:
* filename, title, artist, album, date, track, genre, file type, file size, duration, last play, play count, age, rating, subsongs
As for me, I usually kept the library sorted by full filename and relied on the convenient search function.
I can send some screenshots of MusicBee (browsing by folder) and XMPlay, so that you can make up your mind.