I was glad to finally get around to seeing the Fever. Much of the audience had seen it, that much was clear to me. They howled during the opening credits sequence, specifically the very low shot of John Travolta's boots Ping-Ponging to and from the camera lens. I too laughed. Awesome filmmaking. Later, when the star applied the essential 1970s hair blow-dry, the audience went nuts.
I loved the film, as a film. It deserves its "classic" status. The dance scenes are almost transcendental.
Absolutely, Saturday Night Fever is a wonderful and joyous piece of movie entertainment; even with the non-PG moments.