If guests and cast were charged for each EMS call the amount of calls may be different. Currently a 911 call at WDW can have EMS check the patient out on scene and or transport the patient to the hospital at no charge to the patient.During all hours of the day, you can have a transient population of more than 300K within that 40 square mile area. This is being served by 4 Houses and maybe 30-40 First responders providing Fire and EMS services. In any other location in the world you would have a significantly more response capacity.
The majority of RCFD calls are EMS calls. You have no idea what you're talking about.