I've never connected at YYZ before but noticed the special customs line for US-Canada connections the other day when getting off a flight from the US into YYZ. It looked like there were 2 CBSA officers and a bit of a queue (perhaps 10 people waiting in line). I didn't see a NEXUS kiosk in the connecting line but did not get a very close look.

I have an upcoming trip on AC from DCA-YYZ-YQM. I'll have a checked bag and will have NEXUS. Would it be faster to use the new connecting passenger line (is there still a bus involved?) or just go down to arrivals, use the NEXUS line and then back up to Canada departures?