Does global entry help more on international flights? I'm likely going to have to go to Toronto fairly regularly too.
Toronto I don't think it helps because of how the customs is set up there - for the special line I'm pretty sure you need to have Nexus or your GE card which I've never carried, but when I've flown from there, lines weren't an issue. So, it might help if you carry your card but only in really busy times.
For other international flights, it can help a lot depending on the port of entry setup.