This hotel doesn't seem to accept club access awards even though globalists get club access and breakfast in the restaurant. Seems like the type of thing that shouldn't be allowed so if this isn't an oversight by Hyatt, then Hyatt's loyalty program is actually not as good as I thought.
Since the shuttle does actually take like 1/2 an hour to get to the parks, you'll probably get to the parks faster by staying near a station along the Keiyo line including Tokyo station. The infrequent shuttle also can be full in the morning leading people to wait for the next bus and the shuttles to celebration can also be full. The late start to breakfast and the first shuttle time means that you will not get to the parks early enough to get on any major ride before the wait is over an hour (over 2 hours for Soaring and Beauty and the Beast).
If I didn't have Hyatt Globalist status and need Hyatt elite nights, there's so many hotels I would pick over this one.