I wouldn't be too worried, when is the last time you had to speak to a toll booth collector anywhere?
When they tell you how much your toll is. I don't really even know any French numbers beyond 5 or so. And yes, there may be a sign listing toll rates posted, but suppose you missed the sign or for some reason paid the wrong amount?
You have to cross at least 3 signs like this :La revue de cœur et d'actionLe Courrier de LavalTVA Nouvelles
If you do not understand, after 3 signs, that the car pictogram represents you, the numbers in the VMD represent an amount and the "$" sign means "dollars", then you are doomed... Moreover, if you miss the 3 signs, then pay attention!
According to the 2011 census, Over 60% of the greater Montréal have a good, very good knowledge of the English language or have it has mother-tongue. You'd be out of luck picking a booth where the clerk is unable to gabble the amount you have to pay, even if it is in approximate English...
Anyway, if you are not prepared to use other languages when foreign travelling, you will be better off home, safe and sound.