You do not need to know how to speak French to enjoy Montreal.
Personally, I make sure to have a "bonjour" at the ready when hitting the hotel registration desk but I'm not fooling anyone and we quickly swap over to English.
Honestly, the only language issue I have when in Montreal is with the bathroom faucets.
The "C" on that handle? It doesn't mean "C" for "cold."
It means "C" for "chaud." Hot.
You might want to post a note on your mirror for this one.
I do.