As already addressed by PP, not at Disney, they are well staffed with Emergency Services Units when needed, etc. Now, it is not uncommon for discounts to be offered to first responders (fire, police, ems) but rarely does it require any type of agreeement to respond in an emergency, etc.....and I am not aware of these discounts being offered at WDW on any type of recurring basis (not sure if they have ever been offered, but maybe once in a great while).