I flew out of T3 earlier in the month on AA and it was a joke. The flight was at 6 am so I got there at 3. The AA kiosks weren't working right so there was a line to fix that . That took 45 minutes. We had no checked bags but the checked bag machines were off line till 4. We then lined up for security. So did Nexus and other priority passengers. Security didn't open till 4:30 so a long wait outside the security area. When I say lined up there were no stanchions so you found the end of the line and followed the guy in front of you. The security area doors opened up at 4:30 then we lined up for that. The preclearance area opened up at 4:45 but it was way after that that we got thru security. As the lineups were so bad prior to preclearance once you got there there were no lines so that went fast. We then walked to the gate and got there at 5:20. Overall the place was a zoo. Very little assistance and the lines were ridiculous with lines crossing lines. They need more staff and a bigger terminal.
On return to TO we used our ArriveCan apps to for Covid info and for our declarations. We went to the kiosks, got a printout and walked out. Didn't talk to anyone. I noticed lots of baggage lying around as we walked thru the baggage carousel area.
Except for TO the other airports we went thru were organized and while there was waiting it wasn't unexpected or very long,