This might not be the most popular opinion here, but I spend enough time on planes that I'm fine boarding near the end. If it means occasionally gate checking my bag, so be it. I think of it this way, as a seasoned traveler, I know much more what to do if the airline loses my bag than some rube who this is their first flight in 5-6 years. Plus if done right boarding back to front is more efficient, and with the newer planes and the larger bins it's less of an issue.