I recall another recent thread about renting an EV. I think rental companies are offering specials partly due to the fact they are not popular as rentals and people rather avoid them on vacation. Even those who own an EV said that renting one on vacation poses a number of extra challenges. There are currently no national recharging standards, so even if you find a recharging station, it may not be compatible with your particular vehicle. Charging also takes longer then refilling the gas tank and many rather not waste that time while @ Disney on vacation. Many articles also about issues with various charging stations that are either out of service or require some sort of maintenance and aren't currently working.
I personally wouldn't choose to rent an EV while on vacation, the cost to rent is only part of the total picture. My time is worth something and all of the extra challenges associated with charging isn't something I want to bother with while on vacation.