Your making me feel really old!
It could partly be that, but I wasn't really interested in great classic movies when I was younger. As I matured, though, I've seen more of the old classics. For example, I only recently watched Fiddler on the Roof and learned to appreciate it, and I have yet to really appreciate Casablanca or Gone with the Wind.
I have loved Singin' in the Rain for a long time, but it doesn't surprise me that it's not even in the lexicon of high school musical productions - I've always thought of the movie as much more of a thing than the later stage version.
I think the decline of the attraction's popularity was right in line with the decline of the thematic integrity of the park itself. As other have said, GMR was the thematic centerpiece of the park, but as the park's theme degraded/migrated, it was harder and harder for guests to grok the theme of the ride itself (which I think was described nicely by
@Goofyernmost).
The problem wasn't the movies in GMR. It was the presentation. They could make a ride about a movie in another language that was boring as hell but if the ride was awe inspiring and jaw dropping no body would care. Heck in the good old days they occasionally made rides based on a new experience. Where it failed and why I wasn't a fan, was presentation. I personally felt (my opinion only), was it felt like I was riding in a warehouse at the wax museum, with occasional gags ala a poorly planned jungle cruise. Unlike Jungle cruise or pirates where its mostly static dummys or one move animatronics the theming around them brings you into the mood (youre in the jungle)... because these were movie sets it didn't bring you into the world. For GMR to be a great ride.. it would have had to have had animatronics or a better story... it never made you feel like you were a part of the movie or even backstage...
Imagine if you felt like you were in Casablanca and the figures were life like and moved... you felt the wind blow had the smells of the runway the prop of the real plane swished and you could smell the diesel fuel and everything else around you was dark..... then the temperature goes up and youre in the jungle (a life like jungle) you hear animals then tarzan lets out a yell and a lifelike tarzan swings by....
To me that would have felt like Disney.. instead it felt like a lower theme park...
has anybody seen the video of the flintstones ride? Static figures on a boat ride... no magic.
I agree that execution kept the attraction from being timelessly popular. Of the film genres/rooms covered, I like the musicals section and the final Munchkinland set, but the gangster film section, the western genre, the adventure/Indiana Jones set, and the horror/mummy and jungle/Tarzan sections were merely meh after a while. I thought that the Alien section was pretty good. But with most of these, the movies are way better than the ride and did a much better job of projecting place and scale than the attraction itself.
I wonder if licensing also played a part in keeping the ride from realizing its potential? I feel like The Godfather should have featured more prominently. And there a bunch of other movies I would have featured, but as I was enumerating them I figured out that people who aren't movie buffs might not appreciate them as much as I do. Or that though great movies, they don't represent popular genres for Hollywood.
At any rate, though I'd prefer that GMR be "fixed", at least MMRR isn't inconsistent with old Hollywood.