Sixthscents:
I just popped in and I am still catching up. I am no GF expert like some of the super helpful gals here, but we have had 2 stays with a wheelchair! (Our son has cerebral palsy).
I can also confirm that you won't be able to take the w/c on the launch from the GF to the MK. Our son is very small, and so his chair is quite light and does collapse. Generally, if you can collapse the w/c like a stroller and lift the passenger in (and Mark only weights 45 lbs!), it's generally OK, otherwise it's monorail etc.
When planning for fireworks watching, bear in mind that the music is only piped in to certain locations. Other people can confirm this, but from our experience, the music is piped in outside Narcoossee's down near where the launch docks, and frequently but not always outside Gasparilla's. One trip, our room (lovely castle view 4401) was right about Gaspie's, but we didn't get the music every night.
If your husband (and your budget!) is up to it, we highly recommend dinner at the California Grill, including watching the fireworks from the observation deck. It was the most special night of our first WDW family trip. We were back this fall for Mark's Wish Trip, but with a Christmas party added on, the timing of our ADR and the fireworks didn't work. No worries, this Wish Trip was filled with so many special moments, we just put Cali Grill onto our "maybe next time" list!
We return to Disney parks because all the CMs go out of their way to help us with Mark's challenges, not to mention we all find ways to have great fun. The CMs at the monorail see us coming and get out the ramp, call ahead to wherever we're going so they meet us with a ramp at the other end. Whenever we need an accessible way around, it's there. Makes the trip more enjoyable for all of us!
Alison