Hi Paul,
Thanks for visiting the Disney Parks Moms Panel with your question. You are correct,
Disney's Old Key West Resort is quite large. This is actually one of the features of this resort that I like the most! Since it is so spread out, I find the resort to be very relaxing, and to never feel crowded or rushed. I love the laid-back, Florida Keys experience at this resort.
Because the resort is quite spread out, Disney's Old Key West has an internal bus system with bus stops located throughout the resort. These multiple bus stops mean that you are never too far of a walk away from the nearest bus stop. You should know that since the resort is large and there are multiple internal bus stops, this can add to the time that it takes to get to your destination, so please plan accordingly.
I hope that this information is helpful for you, Paul. Have a great time planning your vacation, and please do not hesitate to ask if you have any further questions.