I think it was handled somewhat appropriately, the only comment that I would make is that if you did have to wait substantially longer than others to be evacuated, I might have requested a second FP or so. Or if you were sitting in the heat, perhaps a bottle of water for each person that was sitting there, if needed. But outside of that, why this need for compensation all the time?
Now, it would be another story if you had been sitting in 110 degree heat for 2+ hours waiting to be evacuated (yes, that happened to me at DCA) and that wasn't because of accessibility concerns, it just took them that long to get to us and had it not broke down, we would have been the next ones off. Needless to say our entire vehicle was very upset. They offered us the same one FP that they offered everyone else, even the ones that had only been there for 5 minutes. We did say that we didn't think that was enough, considering we were stopped in the direct sun for 2+ hours in 100 degree heat. We were nice about it, but Disney did step up. I don't know what all of the others got, but I know that they offered me a fair bit when I pointed this out and also pointed out that I had an assistance card for a reason and our vehicle, which turned out was the only one in direct sunlight was the absolute last one to be unloaded.
What I find strange about your evacuation though is that they had to call the fire department. I know at Sea World San Diego, they have chairs designed for stairs that their security, first aid and certain other personnel can use to evacuate you in such a case. Of course if there was a medical emergency that made it unsafe for them to do so, they would call the appropriate people.