I'm on board with C3PX. My simple philosophy is as follows: Leave it the fuck alone!

It's been a couple of years since I last watched Ghostbusters, but there's really nothing effects-wise in that movie that doesn't hold up perfectly today. But even if it didn't, there's really no point in going in and "fixing" it. Same for Last Crusade too. I know exactly which parts you're talking about because they do instantly spring to mind for being not perfect, but I just don't really see any point in doing so. Like 3PX said, it's been over twenty years, and people have gotten along just fine with it so far. I'm still bemoaning the loss of the reflected snake in Raiders. Bah!