Oh, this is JUST my kind of question, as I'm very into the history of the Disney Company and have read pretty much everything out there on Walt.
I'll just list them:
1. The parks would be spotless, no matter what. There would be no "we can't get competent workers" being spewn around. SOMEONE would be cleaning those parks until they "shined like the top of the Chrysler Building" (to borrow a quote from "Annie")

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2. There would NOT be motion simulators everywhere you turned. Walt would have embraced it when it was new technology and moved on to the next thing as soon as it passed it's prime.
3. Great classics like Carousel of Progress would not be thrown in the "operates seasonally" category. It would operate all the time and be updated whenever new technology came along.
4. Chester & Hester's Dinorama would NOT have ever become reality. The second someone suggested a "carnie" land, Walt would have ripped the plans right off the drawing board and told the guy to get back to work - without the crack pipe.
5. The monorail would be running between all parks, resorts and Downtown Disney - "don't tell me it can't be done - figure out a way".
6. 20K Leagues would not have been stripped away without a plan for either an update or a new attraction to take it's place - and not another character greeting area.
7. Future World would not be stagnant. Whatever needs to be done to keep it current and vibrant - do it - don't rest on your laurels Imagineers.
8. Resort mugs would have a "refillable for life" warranty.
OK, maybe #8 isn't quite what Walt would do, but this is a fantasy, is it not?
