Kind of obvious, but there are 4 parks instead of 2, and none of them are walking distance to each other. With current restrictions, you need a park reservation for the first park you intend to visit each day, and park hopping is allowed after 2 pm. Hopping around lands in the parks is easy, but going from one park to another takes 20 to 30 minutes.
Some restaurants will fill up well in advance of the trip. If there is a restaurant you want, make a reservation 60 days ahead. If you're staying on property, you can make all reservations 60 days from your arrival day.
There are way more Disney hotels than in DL, and the off-site hotels are pretty far off-property. Far enough that you should expect to drive or Uber to the parks each day. If you're going to the parks for more than 2 days, stay on site. It's so worth the extra cost. And you can stay at a value resort for under $200/night.
On-site transportation includes the monorail, boats, Skyliner, and busses. Check out what your resort has. More expensive resorts are closer to the parks and can get you there faster.
Check the weather, because from June through September Orlando is HOT. Like Las Vegas in summer hot.
Once you enter property, you might not see the real world for days. This is what's magical about Disney World. No CVS across the street from a theme park.
Resort recommendations:
Pop Century for value
Caribbean Beach or Port Orleans for moderate
Wilderness Lodge, Boardwalk, Beach Club, or Yacht Club for deluxe