I've just flown on 5 us domestic flights on delta and American in the last two weeks and can confirm that boarding is still a nightmare.
There are 5 different boarding groups on Delta and 6 on American. Everyone in the everyday coach class which is last to board blocks the boarding gate even though they have allocated seats. It's all because no one wants to be the last one on and have their hand luggage at the other end of the cabin or worse in the hold.
European airlines are developing the same problems, the root cause of which is because of charging for a hold bag.
Saying that has anyone ever tried boarding a flight from The Middle East to India/Bangladesh & vice versa ... Some people queue at the check in / boarding gate for hours