Yes, yes he did. He was a pioneer in the personal computer revolution in the late 70s. The Apple I/II were trailblazers, they accelerated the PC revolution by who knows how many years. Without Apple how long would it have taken for IBM to take interest in the PC market, would they have decided to enter it? The iPod and the apple music store did a lot to legitimize digital delivery of media and fundamentally advanced the music industry by years. Look at books, video, and software, which are in many cases years behind music in terms of the industry being coherent about licensing and being accepting to digital delivery. And that doesn't touch on all the other ways Jobs has affected the industry and so much else.
Yes, he really has changed the world, and in a few key instances almost unquestionably for the better.