We stayed at the DoubleTree which is "within" the property and a 'partner' hotel. We had a rental car so that worked well, but I don't think I would've wanted to rely on the shuttle that the hotel provides.
Loved having a huge 1 bedroom suite room with a separate sitting area for everyone to have some space. And mom and dad sleeping in a separate room from kids

All for a very reasonable price of about $225/night (but we were able to use Hilton points so only paid for 4 nights). To get the equivalent of that on property would've been like $600/night (or more). And you DO get the early entry with the partner hotels.
That said, we were there for a full week so we were less concerned about maximizing every possible moment like you might be if you're only going to be there for three days? I dunno. If I had an endless budget I would totally stay at the Grand Floridian or Contemporary or somewhere right on the monorail BUT for those of us whose budget is more like...the values or the moderates...I struggle to see the value proposition vs. staying at a place like the DoubleTree.
My experience.