Nearly twenty years back or so
While I've actually been in Poland for that twenty years (or more)....
Random Polish people aren't going to fall over someone because they're a foreigner. Foreigners (including ones who speak Polish) just aren't that rare anymore. I was in a work meeting earlier today (conducted in Polish but most of the participants weren't Polish).
And most people don't care or think about tourists at all. Those in tourist dependent sectors will be a mixed bag.