Hmmmmmmmmm..... very difficult to choose a favorite movie year...and DR CP certainly makes a good case for the familiar 1939 - how can you beat all those great flicks? In ONE year!
And 1950 wasn't too shabby either, as DRMATTH points out. And 1968, for sure, I graduated from high school in that year.
And although it will never qualify as the GREATEST year - one of my favorites would be 1956: THE TEN COMMANDMENTS, AROUND THE WORLD IN 80 DAYS, FORBIDDEN PLANET, THE LONG LONG TRAILER, BAD DAY AT BLACK ROCK. Oh, and TEENAGE REBEL with Miss Ginger Rogers.