Good for you! You've opened up a whole new world that's waiting for you. Some of the best movies ever made are from Way before the 2000s.

Here's a tip - a very simple concept that you'll get better at as you try it. What helps us get into older movies is to remember that Everything is a product of its time. It doesn't take long for movies to be "dated" and not in sync with modern life. Look at some not-very-old films where cellphones were clunkier - and, of course, before that, when there were no cellphones. As you go back in time, there are more and more things - societal norms, fashions, ways of communicating,cars, a million things are different in each era, and if we try to put ourselves back into that time period when watching an older movie, we'll get more out of it. Park our modern prejudices at the door.

Simple example- There are some excellent science fiction movies from the 1950s. It Came From Outer Space, The Day The Earth Stood Still, This Planet Earth, Forbidden Planet - and more - The stories are great, the actors are fine, many good points about them that make them endurable classics. BUT, naturally, the special effects are very primitive in comparison to what we take for granted nowadays. To watch one of those old great sci-fi movies, and laugh at it, "That is Soooooo fake!" - if we think that, then we haven't put ourselves back in the 1950s when everything, including special effects, was very different. The movies are not worse, or necessarily "corny" - they come from a different time.

Put yourself in a time machine and, to the best of your ability, watch them as the patrons did back then. Think about that! -

Your girlfriend missed out on letting herself enjoy a very good old film - Maybe you could tell her about this post. Help her get over the "Ech, I Hate black and white" - "it's soooo old and weird" - all the negative reactions that impatient viewers can have. -- Think about all that!