I just don't get it. Someone posted a link to a very comprehensive list of companion restrooms around WDW when you asked about it before your trip. I reposted the link when you said that there didn't seem to be many and pointed out that this did not appear to be the case. You stated that you would be able to look this up on your iPod while away.
I don't have a child with a disability but have had to do Disney with food allergies and made sure that I got all the relevant information before I traveled and had it to hand so that I did not have to run around asking questions suddenly when my 6 year old was hungry and I had no clue what was safe for her to eat or where to get it.
When you have to make special concessions and considerations for a child or any member of your party, or even for yourself, for that matter, you make a plan to get that information to hand beforehand and make sure you have it accessible when you are there. Sorry, but that is just basic planning. Sometimes things go wrong and get forgotten or it gets confusing. I get that. But it's not like we went wondering if we might get hungry during a 3 week trip. Just like it's not as if you wondered if you might need to take your son to the restroom during your trip.
You can't go jumping up and down when things don't go exactly the way you want them to. There are countless people in your situation, with or without disabilities who have got by just fine. I don't see why it has to be drama at every turn