Even if you've flown more PMUA than me (don't dispute it, doesn't really matter) you are in a very, very small minority who doesn't see a change for the worse from before relative to the old PMUA boarding order.

Whereas ~1/8 the plane would previously board through the carpet, it can now be ~1/2 (thus, much less exclusive and more crowded). Before, 1Ps could be first through the regular lane (and thus hang out there); now, they have no choice but to crowd around as well to come through after the first big group.

On any hub-hub route, or any hug-major outpost (LGA, SEA, BOS, etc.), it's an issue.