Had a YYZ-ORD flight on UA out of T1 on July 1. Regular line for customs was quite long, but I went through the Global Entry line and it was quick and painless. Through in about 10 minutes. The guys staffing the CATSA checkpoint for GE were actually quite pleasant!
Sitting in the MLL I overheard a woman on the phone telling her friend that they were quoted 3-4 HOURS to make it through security, but they were pulling people out of the line with US passports and it took them "only" about 45 minutes.