The hero with a thousand faces

I listened to this as an audiobook, and while it was fascinating listening, I didn't quite get how this became such a seminal and influential work. Perhaps it's that I've heard so much about it (the hero's journey, the “monomyth”) from literally everyone who talks about modern storytelling, that the contents are too familiar to seem innovative. Perhaps I just missed too much and I need to re-read it as a physical book.