I travel with my mom who has issues with dizziness/vertigo, and she can't really stand in line longer than 15 minutes. And if we have to wait that long she usually can't do another line that long the same day. Luckily we travel in lower crowd times and we've never had to wait long for lightning lanes (plus she doesn't do the headliners which are the ones with longer lightning lanes). Some of the queues themselves bother her as it doesn't take much for her to get off balance in the dark.
We have never considered
DAS in the past even though she did get accommodations while she was still working, as FP+ always made it possible for us to tour the parks. And then when
Genie+ happened we bought that, as even though I myself have no issues waiting in lines, I have zero desire to do so. I do miss being able to re-ride things with passes, since in AK for example she pretty much can only do Navi and Safari, it would be nice to be able to re-ride with how much it costs.
Obviously we are limited in terms of rides we can do together as she doesn't do any simulators or coasters. I usually will do a couple those per day when we are together and she waits for me outside the ride on a bench. We have zero problem splitting up. Sometimes we split up for food, or she goes to the hotel early to rest, or I go to the parks early and she joins me after I do a few headliners.
At Oogie Boogie Bash we went through the treat trail for Oogie Boogie and the room made her so sick that she had to leave the party almost immediately after. The motion of the slot machines and floating cards projects on the walls was too much for her, something I never even considered. That was a bummer.
I sort of forgot where I was going with this honestly

but all that to say, we don't use any Disney accommodations and we do what we can to make the trip enjoyable. Some day she may need a wheelchair/
ECV but mobility wise we are nowhere near that yet, so it's not something that we do now. But I understand why someone like her wouldn't qualify for DAS since it technically would probably work as an accommodation in most situations. Some of the alternate accommodations are interesting. I would be willing to wait in a queue that was like 20-30 minutes, and have her sit outside and rejoin me once it was time to go. I wonder if she would have to go through the queue a few minutes and then exit to make that work though? But it would be nice to do that for things like Safari that were a short wait in the morning but still too long for her to risk trying standby, so we could ride twice in one day.
She can't do happily ever after because it is too long for her to stand unassisted, so lately we have been doing the dessert party so she can sit on the ground before it starts and then usually lean against the railing during the show. Maybe we should consider a wheelchair for just the show in the future, I will have to look into that, the parties are sure getting expensive!