Yeah when I went through on Friday, the NEXUS lines were decent (10m) but security was putting non-Nexus people in the line due to priority or whatnot. I suspect that this is going to get a lot worse before it gets better.
I had a connection through YYZ with a layover for 2h before switching over to a transborder flight. I changed my flights to direct (forgoing the extra segment) simply because I can't afford to get stuck going through security and potentially missing my connection later this month.