On my couple of visits there I found it a bit of a sprawl. It's lovely in parts (like many Cities) but a trip up the CN Tower on a clear day will give you an idea of the scale of the place.
The good news is that the public transport system is one of the best in the world and it's a flat fee for single trips, no fare zones etc,whether you use overground or underground options.
It's also famously the cleanest of Cities, the joke is that "you can tell if someone is from Toronto by the content of their pockets" (because they don't throw anything away) .
Good luck with the move, I am big fan of Canada, although Vancouver is my first choice if I was ever to get the option to go.