I am so grateful for this thread (and GE!). I had an early morning flight from YYZ to DCA yesterday morning, and when I entered the customs/passport area, the line filled all of the available space. From the discussion on here, I knew that I could go straight to the Nexus line. There were still 4 people in front of me, but as I chatted with a guy standing adjacent in the regular line, he had been waiting for an hour, so I'll take my 5 minute wait any time.