Post 28 on page 2 of the disABILITIES FAQs thread has information about attractions with stairs and moving walkways. You can find thst thread near the top of this board snd there is also a link in my signature.
The attractions with stairs all have a way to bypass the stairs - other than Swiss Family Robinson Treehouse and most of Tom Sawyer‘s Island. You would let the CM (Cast Member) at the entrance and each of the CMs directing guests after that know that you need to avoid stairs (
DAS - Disability Access Service - is not needed to do this)
Most attractions don’t have moving walkways and do come to a complete stop for loading and unloading. They don’t move until the CM sees everyone is on and seated.
For attractions with moving walkways, guests who need it stopped or slowed generally are both loaded and unloaded at the unload area. Again, DAS is not needed for this; just tell the CMs. Some have a dedicated loading area for guests with disabilities - for example, Mickey’s Runaway Railroad mentioned by other posters. Kali River Rapids has an interesting dedicated loading area. One of the boats is actually floated into a loading area with a gate closing to trap it there to load from a stationary dock. That is a ride I would not suggest though - the doorway into the boat is narrow and there is a kind of difficult step down. Besides that, the floor and seats are wet and slippery.
I would also suggest that Peoplemover/Tomorrowland Transit Authority is one you may want to skip. There is a a steep moving speedramp to get up and down to the elevated load/unload area.
Most attractions with moving walkways have a pretty long exit area. Peter Pan is the exception; it has a pretty tight end walkway with a wall at the end. Even though some people report seeing it stopped for loading and unloading, that is rare (to the point that I’ve been told ‘almost never’).
You may not have noticed, but CMs are always walking backwards on the moving walkways, facing guests and watching for guests who might be having problems. They usually carry a button that can be used to emergency slow or stop the moving walkway if needed.