I reentered the US from Windsor a few months ago and the Nexus line was backed up but could just sail through the regular line once they inched enough past the tunnel.
TBH, I’ve gotten a lot more shit over the years from Canadian authorities at the border. The Canadians are tough about foreigners with convictions entering the country, and if you share a name with someone with a DUI, sometimes you get flagged. All border police do random tit for tit enforcement or look for specific things for reasons.