@rikosi While this isn't exactly what you're looking for, enabling the moodbar feature and setting it to be displayed in the track progress bar does communicate what the track sounds like visually and lets you scrub through it. It does help signify changes to the track like the drop and quiet parts, although it's not quite as easy to interpret as a waveform.

This is a feature I would use too, but for different reasons. I've got an Unsorted/Untagged folder which is mostly just a mess. I also keep my Classical music in a separate folder since It needs to be tagged and handled differently.