You almost certainly have a favorite movie. Most people do. You've probably watched it a whole bunch of times, too. How many times would you say you watch it each year, though? Once? Maybe twice at a push? Three times if you're going through a rough time and you watch it for comfort? You don't love films as much as your children, then. They could sit through their favorite movie or TV show three times back to back, and still want more.
If an adult watches the same thing on repeat, they'll quickly get bored. Children don't; they just get entranced by the magic and wonder of it all every single time. That means you better get used to seeing the same children's movie a hundred times between now and this time next year. If they're the sort of child who goes for Disney films, the soundtracks will now be in your head forever.