When I used to have carry-ons, boarding early ensured that I got room in the overhead bins to place the bag. I now use under-seater bags only and pack light so I no longer care when I get to my seat.

Yep. I've taken several flights in the past few months, and _every time_ by the time my boarding group was called, the staff announced that there was no more overhead bin space, and people would have to check bags.