I've never been with someone like that, but my MIL went May 2002. She went with her husband (DW's stepdad), her son, and, unfortunately, her granddaughter (DW's niece), Megan, who was 9 at the time. She REFUSED to go on any ride. She wouldn't even get in line. Splash MT was too wet, Space MT was inside, i.e. dark, even the Carousel went too fast. They actually got her on Dumbo, but Megan wouldn't let them go up because it was too high. My MIL ended up sitting the rides out with her while her husband and DS went on everything. She is normally a very patient woman, in fact, I have never even seen her upset. However, by about the middle of the second day, she was ready to STRANGLE Megan! Megan also screamed and cried every night (they stayed at WL) for her mother. A nightmare, but MIL kept her cool, didn't force her to go on aything. Huge waste of $$$ for her... When they got back, I told her about switching off.
Anyway, we're going with my FIL and DW's stepmother in September. They talked about taking Megan, and we were like NO WAY!!! We won't go with them, if they take Megan. Well, it turns out, Megan doesn't want to go anyway, even with her Mom.
She's the only person under 12 that I've ever heard of not wanting to go to Disney, especially when she's part of this family, which is full of Disneyphiles. Oh well, to each their own!