@BroganMc, This is just a hypothetical situation, but tell me if this is feasible (I have no personal experience, so I am genuinely trying to understand here):
Let's say you get the return time card for Attraction A which has an hour wait. You then decide to ride Attraction B while you wait for your return time for Attraction A. Attraction B also has an hour wait, and the line is wheelchair accessible through the Stand-by line, so you wait the hour. But because you need a specific wheelchair car, you wait an additional 30 minutes. Total wait time for you at Attraction B: 90 minutes. You then return to Attraction A (through the FP line, which is typically 5-10 minutes), which you are able to transfer into the seat yourself due to the configuration of the car. It takes you one-two minutes longer than the average guest to board, but nothing worth noting. Total wait time for Attraction A: 10 minutes. (Obviously, these are just made up rides and wait times, but I think they are plausible scenarios).
Now, one could argue that the
total wait time for Attraction A was actually much longer than 10 minutes that based on when you got your return time to when you
actually boarded, but you still got to experience both attractions in 100 minutes total. Guests without the DAS have to
physically wait in both one-hour lines, so they would end up waiting 120 minutes to experience both attractions. Also, you can still utilize the regular FP system, so you could have cut your wait time for Attraction B significantly as well. Either way, you still end up waiting less than non-DAS users. Again, I have no personal experience with this, so do correct me if I am wrong, but it seems possible to strategically plan your DAS and FP usage in an efficient manner based around which attractions have specific wheelchair cars and which have easier vehicles to transfer into so that way you are not waiting more than the average guest, especially since the DAS essentially allows you to always be waiting in two lines (one physically, one virtually)
at all times, compared to non-DAS users who can only wait in two lines up to three times a day through their three FPs (less if they choose parade or fireworks viewing for one of their FP). And you might even be able to virtually wait in more lines than that, since I have heard that rides without wheelchair queues (Space Mountain, for example) will write out return time cards for wheelchair guests separate from the DAS system. You could hold a DAS return time for Buzz Lightyear, a wheelchair return time for Space Mountain, and a FP+ for Haunted Mansion all at the same time. And since the first two don't have expirations, you have a lot of flexibility in getting from one land to another.