I use an injection drug that must be refridgerated also. If my dosing time is to occur while in the Parks, I bring my meds & supplies to First Aid, where they cold store it & supply me with a private room to do my injection.
If you didn't want/need to carry insulin injection with you while touring, this might be a handy option for you. I have found it to be very helpful & much easier than carrying my supplies & trying to find a private place to do my shot or going back to the resort to do it.
That said, I think I will look for that wallet size cold pack for transporting my meds to & from the Parks.....