When I first visited Paris some 34 years ago, few people could, or would, speak English.
Times have changed. People who deal with tourists will speak some English because they have to. It's not just Americans who rely on English when traveling. it's many people. (English is the most spoken second language in the world.)
But I will also reiterate the politeness issue. Always greet a person with "Bonjour, madame" or "Bonjour, monsieur."
Story out of Paris. A tourist walked up to a waiter in a cafe and asked "toilets." He responded in English, "Madame, my name is not toilets."
Then learn a few other words or phrases...Hello, Goodbye, Please, Excuse me, Thank you, Where are the toilets?, etc.
In Paris, if you are polite in your greeting and at least try a few words in French, you will go far.