This winter is pretty mild so far, I think it hasn't even arrived yet, which is odd.
Winter is usually pretty bad in Canada, but it really depends on where you live. It lasts for long and it's really cold (-15/ -25 Celsius during the day), a lot of snow. However, life doesn't stop at all. Everybody is used to it and you will be too. Special coats and boots and you will be ok. To be honest, winter can be really beautiful.
I don't regret I came here, however, living at a tropical island would be better in the winter for sure.