YYG has a priority/se line?
Also "all the other agents". How many were on at YYG. I'm used to be there being perhaps 2 at best at stations like YSJ, YYG is a similar no?.
Thing is, if the agent spent 30 minutes dealing with that somebody the number 1 issue isn't that you weren't dealt with quicker/next but that it took 30 minutes to process that case in the first place.
That will have held everyone up. I've had times at YYT before where there are too many people bag dropping and not enough staff so I've been kept in line waiting whilst they (correctly) try and clear the huge backlog in the normal line.
YYT I wouldn't even call a small station by any means. But when you get down to small stations with between 1 and 3 staff, everyone on the same flight you have to accept this might happen, even if it's not supposed to.