Karen - what airline were you flying with?
We came all the way on Air Canada; so we were entirely in Terminal 1. But we also have some privileges because DH is a Million Miler with AC. If I fly alone, w/o him, I go cattle class like the rest. The lounge is well worth it. But Toronto is a very large, very busy airport. We don't go through it if we don't have to. US customs is awful if we go to a US destination through Toronto (Phoenix last Feb.) Ottawa is mush smaller and it's easier to clear US customs there if we can, but because it's smaller, we don't have as many direct destinations available.
Still, I think Toronto might be preferable to making a connection at O'Hare.
Anyway, we are safely in Milan and I'm about to take a nap as I don't sleep on planes.
