I haven't seen Casablanca, or any of The Godfathers, and probably a few other well-regarded classics of cinema. Part of it is just a general interest in newer releases and "keeping up" with current film discussions, but another part of it is trying to watch these legendary films in proper circumstances, with no distractions or other obligations to keep me from giving my time and attention to the film. It's hard to clear out one's schedule for a 3-hour film like The Godfather when stuff like work, family, friends, errands, hobbies, etc. take up so much of the day.
This can apply to any medium as well, not just films.
This can apply to any medium as well, not just films.