I arrive about an hour later from DCA.
We then had to wait for a gate (20 minutes) and then another 20 minutes for an agent to open the door.

Once at the top of the escaltor, we were directed to the right into a long line of people holding to await permission to go downstairs.

They were yelling for connections so I was able to move to the front in about 20 minutes. Local YYZ people were not allowed to come forward.

They had police and other officials to "manage" the crowd.

I bought a full fare ticket DCA-YYZ-YVR (stop) and then on to ICN.

I am a *G and I won't be buying an tickets to transit YYZ T1 anytime soon even though it is not the fault of AC.

I too agree that about 1/3 booths were occupied.