Snow White: being sweet natured
Cinderella: being kind and posetive no matter what situation you are in. It literally is have courage and be kind
Aurora: being positive no matter what
Ariel: if you some someone or something it will require a certain amount of sacrafice
Belle: don't judge a book by it's cover. Each of these movies thought a lesson. The waist size was the last thing on my mind as I watched them as a kid
To be fair, these are quite sanitised interpretations. You could just as easily say the following:
Snow White: a woman's place is in the home, caring for men. Gets sexually assaulted in her sleep.
Cinderella: if you tolerate enslavement with good cheer and are very beautiful, someone rich might rescue you
Aurora: where does she exhibit limitless positivity? She cries in despair when she isn't allowed to marry the first man she meets, and is then asleep for most of the rest film before she's also sexually assaulted in her sleep and then marries her abuser.
Ariel: you should use your body to make men fall in love with you - it doesn't matter if they have literally never heard you speak. You should also be willing to give up everything (family, friends, voice) for the love of a man you don't know.
Belle: Stockholm syndrome; if your captor treats you with some humanity, it makes up for the fact that they abused your father and imprisoned you against your will.
A lot of your defence of the films focuses on the idea that you should be sweet, kind and cheerful. And while there isn't necessarily anything wrong with those things, it is a really strong example of how girls specifically are socialised. Is that a good thing? Probably not - being kind is great, but why is this message aimed at girls and not boys? Why is always girls who are taught that they have to be accommodating, be kind, and make sacrifices? If these are universally good traits, why isn't there the same emphasis on teaching boys to be this way?
I'm not slamming Disney films outright. They can be fun, and some of the more modern ones (Moana, for example) have very good, positive messages. I also don't want to judge things like Snow White too harshly given that it's 80 years old. Some of them are very of their time. But I don't think we need to try and shoehorn a great feminist message into them where it doesn't exist.
I also think all of the points about the heroines all being thin, attractive, able bodied and (mostly) white are perfectly valid and not to be dismissed out of hand.