This is what WDW website says about guests using wheelchairs or
ECVs:
« Other Considerations
A Guest whose disability is based on the necessity to use a wheelchair or scooter does not need
DAS. Depending on the experience, Guests utilizing a wheelchair or scooter will either wait in the standard queue or receive a return time at the attraction that is comparable to the current standby wait. If you’re a Guest who has mobility questions or concerns, please view
Services for Guests with Mobility Disabilities. »
In the DAS FAQs, the website restates the same information:
« If a Guest’s disability is based on the necessity to use a wheelchair or scooter, are they eligible to receive DAS?
No. A Guest whose disability requires them to use a wheelchair or scooter does not need DAS. Depending on the experience, the Guest will either wait in the standard queue or receive a return time at the attraction based on the current wait time. If a Guest requires additional assistance, they should go to Guest Relations. »
So, depending on the attraction, without DAS you should have been sent thru the regular line or, if the regular line is not accessible, received a wheelchair return time.
If using the scooter in lines meets your needs, you would not need DAS. CMs at attractions may recommend it, but in the past, they sometimes didn’t even realize guests didn’t need DAS to a wheelchair or
ECV in lines.
This is what the WDW website says about who DAS is and how it works
«
What is Disability Access Service (DAS), and how does it work?
Disability Access Service (DAS) is designed to accommodate Guests who have difficulty tolerating extended waits in a conventional queue environment due to a disability (including non-apparent disabilities). The service allows Guests to schedule a return time that is comparable to the current queue wait for the given attraction. It does not provide immediate attraction access. »
Some people using a mobility device have multiple other disability related issues that prevent them from waiting in the regular lines.
My youngest daughter has cerebral palsy, which prevents her from walking, standing or transferring herself. She uses a wheelchair for those issues and if those were her only issues, she would not need DAS. She qualifies for DAS based on other issues that the wheelchair doesn’t address.
So, it really depends on whether or not your needs are met by using the scooter in lines.