My grandparents lived on the landing approach path to JFK, out in Floral Park. When the Concorde came in, you freakin' knew it was the Concorde. It was a lot louder than the other airplanes on that approach, and it was nice that it only went over twice a day (It was a very cool airplane, and we'd go out to look, at least for the morning landing).
I dunno about "normal cruising speed", but on "approach to JFK" it was a hell of a lot louder than the 747s, DC10s and similar of the late '70s and early '80s. Looking at the approach profiles I see that the aircraft were probably at about 2k feet over Floral Park. I reject your statement, from experience.