I did do that for sometime but I found that my commute has gotten worse with more accidents and constructions so I'm finding that almost 40% of the time my commute changes with Waze with new routes saving me tons of time in traffic. Plus it allows me to explore the country side more as a side-effect.
How is Waterloo 30 minutes in the other direction...Also Mississauga has grown and with the transit and rail systems, Toronto to Mississauga is a breeze so you don't have to live in Sauga to work there.
Its probably too creepy in terms of privacy to detail how it works which in turn will give themselves PR. I can only assume it uses arrays of cameras and sensors with deep learning. Glorious amounts of tracking data.