Part of our planning to accommodate DD's disability is the timing of our trips. We don't go during peak travel times. There's never been a 3hr wait for us to use DAS for, because there's been no 3hr standby wait in the parks for anyone.
I went through our DCA day 1 in my head last night, with the number shared here of 10 attractions being the average for most typical guests/day. We did 9 attractions, give or take one or two, and that's including rides we did more than once. We didn't have some huge advantage over everyone.