Our boarding in Brooklyn was no picnic, although the complications may have been due to the race. My understanding is that all of the NYC daytrips were cancelled due to the race, so when we arrived (roughly 10am) the outer entrance area was already getting crowded with roundtrippers waiting to reboard and other early arrivals. By the time they were able to start reboarding the roundtrippers (11am?), the place was packed. Possibly because of this, they had a wacky check in process in the outer lobby. Staff members were checking the basic documents (including proofs of vaccination, by the way) before we even got into the snake-line, and initialing the boarding pass. But this must have been an ad hoc procedure - it was never actually announced for quite a while, different staff were doing it different ways, and there was much retracing of steps. After passing through security, there there was a line for making a declaration of health status; this was handled pretty cleanly and quickly. Then we were sorted into Grills (and diamond members?) and everyone else; we Grills waited an additional half-hour or so in the waiting lounge, then boarded ... about 12:15, which was the boarding time on our passes. We'd intentionally arrived early, expecting problems, but might have been better off arriving right on time.
In any case, we just had a wonderful week on the Queen.