Pretty spot on about Lawrence East. That place is just hopping and relief is needed. I've heard they're going to do something about the Superchargers there - just no timeline. If, indeed, the map of future SCs is accurate, I can see a lot more traffic coming through Etobicoke, especially for commuters coming into the city from places west.
Muskoka could use one a bit further south as well - around Gravenhurst. It would be strategic for those heading eastward as well as northbound. Huntsville is a bit out of the way. Come to think of it, one near Collingwood would be appreciated too. Let's see what happens as the network expands.
On a side, I've heard late 2018 for Model 3s to start in Canada. That sounds a bit long in the tooth to me.