Bullshit on every level.
I have never seen a toll booth where you can't go and hand pennies to the cashier. You may have to wait up to a few minutes in line with other cash customers, but they certainly take them. If you use coinstar like services, they charge a ridiculous fee...unless you exchange for a gift card instead of cash. Amazon, the store where the coinstar is located, a large number of chain restaurants, etc., will let you turn in all your coins and get a giftcard, to the penny, with no fee.
I would hate to have to worry that I am losing or gaining pennies on every transaction that I participate in. If that is only 20 transactions per day, I could be losing over $200 per year; or for most americans, 2 days wages!
You would be hard pressed to find an American who wants to live in Canada. Change isn't normally the reason, but if it was mentioned, it would certainly be a valid one.