At least there are menus, I guess. Some power user tools (eg: vim) don't give much in the way of discoverability. You either internalize a significant amount of knowledge and behaviour, or you hate it and move on.
IMO, Foobar2000 [0] was/is the zenith of bespoke GUI programs from that era. The UI is clean, the menus make sense, it’s infinitely configurable but the defaults are fine, it supports plugins…