King Kong vs. Godzilla was my first VHS Godzilla movie and the first G-movie that I watched all the way through. I watched it so much I still have the American version practically memorized. In fact, I showed this Godzilla movie at the day care I was staying at that summer and hooked the lady's son and pretty every kid there on Godzilla because of that movie. I'm sure a lot of parents loved me.
Recently, I acquired the Japanese version of this film and it was like watching an all new movie! I loved it. It was so much better it's not funny. I loved the humor that I missed out in the American version and the soundtrack. The UN reports constantly bring the movie to a grinding halt so much that the Japanese version sometimes feels like it goes by a lot quicker than the American version.
My final thought: If you haven't seen the Japanese version, you should. It will change how you feel about the film.