AC 105 departing from D-24 at YYZ this AM, full 777 300-ER, GA's were doing a great job of announcing and policing the zones, which is totally necessary as I'm pretty sure that gate was designed for E-190's and A319's...they were even announcing how many people in each Zone - Zone 1 = 42 (which I thought was low given J was full), Zone 2 = 104!!