Disney, Universal, to and from the airport. No issues for 8 days.
We're not Magic Kingdom people, but Epcot is awesome. And instead of Sea World, to to Discovery Cove.
Ellen's Energy Adventure will be replaced by a Guardians of the Galaxy ride, and Disneyland Paris' Ratatouille ride is coming to the France pavilion.
We have stayed at World Center a lot. Parking is expensive--if you valet... and it gets so busy that even if you call ahead for your car--it can take a LONG time like--30 minutes. At check out--its terrible. You can self park, but it is a bit of a hike.
World Center has pools, which are nice... but if it is packed it can be really crowded. We have actually left the pool a few times because it will be so busy. They do have an adult pool I think--I'm trying to remember, since we always have the kids there.
I would check to see if there is a conference at the hotel (there usually is) so you are prepared.
Uber isn't an issue. My last trip there I was picked up in an Escalade as the guy was trying to drum up business for his real driving gig.
Reading your "30 miles north" comment might make me a little concerned. Maybe try the linked fare estimator? I'm not saying you can't do Uber, but I have never personally tried to get a lift from that far out of the city.
Near the attractions, the airport, downtown, and the suburbs around any of those, you are good.