Steve Jobs was no more a visionary than anyone else. His strength was looking at existing tech that was useful in theory and making it useful in reality, by employing his OCD-ish drive to keep going until a thing was done right, and to always see it from the end user perspective. A seemingly trivial thing like Apple establishing the term "App(lication)" (now adopted by MSFT in Win 8) rather than Program speaks volumes about the philosophy. "Program" communicates "go away, pesky human, this is between hardware and software". "Application" is user centric and addresses the question "what does this thing do for ME in MY life/work/whatever?"Pure bullcrap. Look at Bill G. vs. Jobs at ATD 2007(?). On stage, Bill G goes on to state that tablets will become mainstream in 5 years (i.e., 2012). Problem with early MSFT tablets is that they went too early to market. (However, i think even they recognized that. Geeks - rather than marketers - as they were, they just did not see it as a reason not to push it anyway). Not that MSFT has an inability of "getting it". Geez, just look at all the exciting things coming out of MSFT research whether its courier, surface, optical screens, perspective based direct eye projections etc. MSFT may not have the taste of Apple, but dont mistake that for an inability of seeing where technology is heading (especially when it is in plain sight, contrary to "popular MR" belief).
We could go on and on about how everything Steve ever introduced existed before... how the mouse had been around since the 60's, how mp3 players already existed, how smartphones and tablets and multitouch already existed... but why is it always that it isn't until Apple does it that everyone goes "Ah, THAT's how it's done", and then they all copy it? Because Steve tweaked and tweaked, he tortured everyone involved and had them do 200 different versions so he could reject 199 of them, much like Stanley Kubrick drove everyone bonkers with 50 takes that looked exactly the same to everyone else.
Going the extra mile that only crazy narcissistic asperger's OCD perfectionist freaks will do, is the secret of Apple's success. Because it's what makes things so easy and intuitive to use that you find yourself out of excuses to not utilize them. Since people are inherently lazy and impatient, that final push is the difference between things that become part of our lives and things abandoned by the wayside.
Take the iPhone -- smartphones with internet capability had been around for ages, but only 15% ever bothered to surf on those devices. With the original iPhone, that number soared to 80%. What was the difference? Steve, and all the people he tortured to elevate the concept from clicking on stuff with a stylus to touching the Safari icon with your fingertip and then pinching to zoom.