Passed through ICN immigration on a Sat ca. 2 weeks ago shortly after 5pm and happy to report that the whole area was virtually empty – perhaps some 20 people spread across 6 or 7 open immigration checkpoints. Took me less than 5 min to get through.

On the return leg a couple of days later at around 9pm on a Thu exit immigration took a little bit longer but not more than 20 min in total for both security check as well as passport stamp.