I'm an OEF vet and me and fireworks get along about as much as a cat and a bath, but seeing as I've never been to Disney, I'm going to do my best to watch the fireworks when I go in April.
They use to trigger my PTSD really bad, but so did large crowds. I've managed to get over my fear of large crowds in the last ten years, so maybe I can manage fireworks. Never know until we try. I just don't think a first time Disney experience would be complete without at least attempting to view the fireworks.