Depends on how you define recently. I did in December 2021; my GE status was unclear since it had been extended due to a lack of appointments from COVID. I kept trying to get an appointment and nothing made it clear whether I still had GE or not.
Flying on EK I went ahead and tried to enter through the GE kiosks and they said "nope, you expired". I downloaded the mobile passport app, filled everything out and got through in probably an extra 5 minutes. Then went and did my GE extension in IAD customs.
EK of course arrives when there aren't as many other international arrivals.

I can't recall seeing much of a line for MPC in subsequent trips through IAD.