Funny enough, one of the places we saw other
DAS users on our trip last week was at the Christmas party at Space Mountain. I know for us, the rides we use DAS on at the parties are those with overlays since those standby lines are usually too long for us (other rides standby is short enough we can just wait), so maybe others do the same so more DAS users are concentrated on those rides with overlays at the parties? I will say there was a shocking number of people in the LL for Space during the party.
I did notice one of the times on Space there was a huge group ahead of us that used the LL during the party and they were definitely not DAS (party was too big and none scanned in blue), so there are definitely other groups using LL during the party without DAS, whether it be Golden Oak, Club 33, Ride Recovery, etc. I wouldn't be surprised if these other users make up a small but noticeable chunk of LL users.