I was also born with a profound hearing loss in one ear and moderate to profound in the other. I stopped wearing a HA in my worse ear at age seven. I am completely oral and do not sign. (My mother said I was an expert lip reader by the age of 3 and would get extremely upset when a speech therapist would cover her lips.)
I suddenly lost the rest of my residual hearing and received a cochlear implant in September 2004, which has really been miraculous for me.
Aside from that....
Does your child use an FM system at school? I had one (since 1982 - when they first came out - my parents jumped on it and bought me one) and if I could tap into the FM system at places outside of school, I did so.
I've heard that you can tap into the FM system at WDW. You may want to look into this as I am not familiar with this because I no longer use an FM system. Or, you could obtain a handheld captioning device. There's also the reflective captioning.
There's also some debate that deaf/hearing-impaired persons don't need a GAC. I disagree. I get a GAC as "insurance," plus it saves me the hassle of having to explain why I need certain services. The GAC just states my needs, and leaves it at that. It's not that I don't like explaining my situation, I don't mind it at all really. But there are just times when I'd just as soon not take the time to explain why I need such and such every. single. time.
Feel free to PM me if you have anymore questions.