cmus [1] is the closest I found to foobar2000. It is my main music player now, after years of disappointment. It supports FLAC and they claim they support CUE sheets, although I haven't tested your particular scenario. The way I use it is I have all my library in it at once, iTunes style. It has good search & playlists, but no drag&drop, since it's just command line...

[1] https://cmus.github.io/