Is the purpose of music notation to be something you can set in front of a musician and make them play the music the way you want? In that case it performs pretty well, though it varies widely by instrument (both the ability to let them perform, and the actual notation).
But if the purpose is music literacy, letting regular people read a score and be able to hear the music in their head, then it's not working well. Even experienced musicians (like I assume OP is) usually associate notation not with sound, but with finger and lip positions first, the means needed to reproduce it. And only then, sometimes, from finger positions to sounds. I remember the band kids in ear training classes in high school wiggling three fingers, playing an imaginary trumpet, in order to be able to sight sing.
The reason I'm interested in alternative notation is that I dream of being able to read music like I read text. Who wouldn't want that? And despite having learned to sight read on some instruments and to sight sing reasonably, I don't feel like I can do that.