Pearson can be Piercing. I love this airport until I have to interact with those yellow uniformed staff that control the line ups to the U.S gates. These individuals are more clueless then a foreign traveler who can't read signs in the local language. I have seen way too many of the following after interactions with these peeps-passengers being directed to the wrong lines, passengers being given customs declaration forms who don't them (and the other way around), people randomly selected from one line to be placed in a longer line. Getting past these folks has proven to be tougher then facing border patrol especially when encountering several of them conveying contradictory information. In a nutshell, expect delays, these yellow folks are just like the yellow in a traffic light-they slow people down.