Yep, I’m a native English and French speaker and when I speak in English to someone whose first language is a Romance language I make an effort to use more Latin-origin words, which does make the English sound very formal to native speakers.

Haven’t had a chance to try it with folk whose first tongue is a Germanic tongue because they all speak really good English, but if I came across someone who didn’t have great English I’d probably use more Germanic words.

I find this subconscious perception of speech with more Latin-origin words interesting though. Something about Germanic words just feels more earthy and real, Latin-origin words feel quite flowery and sort of hard to pin down.