It's definitely orders of magnitude better at any time than trying to get on the subway in Seoul at rush hour, though! ICN was really great. My one experience at NRT was also pretty good, although the security line for connecting flights was a bit zoo-ey.

ORD can be a zoo, as can ATL - if you've never experienced the main security line backed up through the atrium, around the baggage carousels, and back toward the ticketing counters, consider yourself fortunate.