We're staying at the Hyatt the night before our cruise and are taking a limo to the port on Saturday morning. We will have two other families with us, so we plan to purchase the baggage only transfers, which costs $25 for up to 6 bags. This is different than the regular transfers which are $25 per person. Each family decided to purchase the bag only transfers because our limo will not be able to hold the luggage for all of us. This way, we get to enjoy the limo ride and our bags will meet us at our room on the ship. This also ends up being cheaper for us than if everyone paid for the regular transfers for everyone in their family.
I have spoken to numerous people at Disney and the Hyatt and they have confirmed that we can do this.
Good luck and enjoy your trip!