History being written by the victors here, I believe.
He designed some clever things for example bit-banging the floppy interface which allowed the Apple 2 to have floppies at a lower price point than competitors. Another innovation of the Apple 2 at the time was its use of a switched-mode PSU. It was almost certainly the first personal computer to have that, but designed by Rod Holt not Woz. He didn't invent the switching PSU -- they were commonly used in portable test equipment at the time.
Having been alive at the time and paying attention, I disagree that Woz invented anything very significant. Definitely an important figure, and a clever guy though.