In general, it works the same now as in 2018. The 3 biggest changes at both WDW and
Disneyland are:
1) Guests can either register for
DAS at the theme parks (Guest Relations or Guest Experience Umbrellas) OR register ahead of time using video chat (Between 30 and 2 days before your first park visit)
2) Guests registering by video chat can prearrange 2 DAS Advance Selections in connection with the video chat. These are separate from DAS Return Times and don’t need to be used before making a DAS Return Time. Unlike Return Times, they have a 1 hour window for use.
3) DAS Return Times can be obtained in the My Disney Experience app by you or anyone linked to the DAS. Guests can still obtain DAS Return Times at the attraction or from CMs at Guest Relations/Guest Experience umbrellas.
This is a link to a thread with the updated info about DAS at WDW. There is no need to read more than the first post - the rest is discussion and questions/answers starting from before the changes rolled out.
This is a link to the WDW website info about DAS. This includes link for video chat.
This is a link to Disneyland website info about DAS. Includes link for video chat.
Disney also has a Guide for Guests with Cognitive Disabilities that was published since your last visit. WDW and DL each have 2 resources. One is general info and the other is ride specific like loud noise, periods of darkness, etc.
Link to WDW Guide for Guests with Cognitive Disabilities.
Link to WDW Attraction Details for Guests with Cognitive Disabilities.
Link to Disneyland Guide for Guests with Cognitive Disabilities.
Link to Disneyland Attraction Details for Guests with Cognitive Disabilities.