I've seen all of Disney's classic animated full-length movies except for
Cinderella (1950) and
Sleeping Beauty (1959). They're definitely worth seeing at least once, but I can't say I could watch any of them repeatedly with the same amount of enjoyment and/or enthusiasm.
As for the movies on my list, the only one I didn't seen in a theater when it was initially released was
101 Dalmatians. Hell, I predate the advent of color television sets being a common household item.
I remember Disney movies being a "big thing" when I was growing up in the 60s and 70s, so I saw more of them than I really wanted to; Disney was more "hit" than "miss" with their movies in those days, but sometimes not by much. If you're interested, I'd suggest you start with the obvious favorites such as
Snow White and the Seven Dwarfs,
Pinocchio,
Fantasia,
Dumbo, etc., and then ease into the more popular live action movies of those eras such as
Treasure Island,
20,000 Leagues Under the Sea, and so on.