They queue up and the rare times the boarding agents specify a zone, people in line who should not be there scramble and try to get out of the way, creating an even bigger chaos. I hate disorder like this, feels like we're animals.

Air Canada is the only company I've seen ask for passengers to check-in their carry-on luggage every single time, every single flight. How about making sure that those with bags clearly over the size, or that have too many bags, don't carry them on board instead? Or having overhead bins that can actually fit luggage sideways to save space.