For those that have been around YYZ since the early days, you surely remember "FedEx Hil". This small hill was a great elevation to shoot without a fence in your way. The hill is no more but still a popalur gathering spot for all spotters. Keep your vechile parked to the l/h side of the road to keep the road open for emergency vehicle's if there need were to arise.
Great side/head-on views of touchdowns on runway 23 at this spot. There is a large jet wash wall blocking the view for touch-down but you can get some great shots of aircraft a few seconds before. Leave your car somewhere legal and out of the way and walk to this location. Parking at Wendy's is fine and it's only a quick walk across Airport Road.