It's easy for anglophones to have a blasé attitude toward the introduction of the odd French word into English. They might feel differently if they were confronted with French terms everywhere they turned, if they had to use French expressions to describe everyday occurrences in their lives, because no English ones existed.
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As others have noted English is full of French words. According to Cactus Blog, "...words derived directly or indirectly from French now account for more than a third of English vocabulary. In fact English speakers know around 15,000 French words, even before they start learning the language." Many of the "English" words and expressions the OQLF fusses about may be derived from Normandy specific, provincial French usages which never found favour among the Paris-centred French elite.