The Real ID requirement has been a known entity for several years, even if the deadlines have been extended a few times. As with anything involving a deadline, there are likely people who always wait until the last minute and then want to blame their long wait times on anything other than their procrastination. I upgraded mine a few years and it was no big deal. As I recall, there was some other documentation I had to get and they had a separate line for those returning so you didn't just go to the end of the line. People are given a number when they arrive and there is a seating area where you can wait. You get served based on the order of the number you were given, but like others have said, the exact process probably varies from one state to the other.