I was in the Magic Kingdom last Thursday, and it just became a running joke that rides were constantly stopping on us. We spent more time stopped on the Haunted Mansion than we spent moving. Mermaid stopped multiple times, as did Buzz Lightyear... plus Imagination and Gran Fiesta Tour at Epcot. I didn't do SS Earth this time, but I'm sure it would have been a mess of stops too.
As a former CM I know that a lot of times when an Omnimover stops its to allow someone with a disability to board, but there comes to a point where the constant stopping becomes awful show and totally ruins the experience. The only other reasons I could see for the stoppage is that they are really breaking down (possibly on the non omnimover rides; Imagination, as the ride went completely out of sync after the stop and after we got off it was listed as closed for a while, and Gran Fiesta tour where the boats just floated in silence from the second room through to the finale) or possibly riders (probably non english speaking) misbehaving.
Am I being insensitive in thinking they need to limit how often they will stop rides to allow wheelchair transfer for the sake of show?