Anyone paying attention can see what an effect Disney has on it's young audiences. Most children are introduced to Disney at a young age, during a vital developmental period in their lives. These children are inexperienced and innocent, and what is taught during this point in their lives stick.
Characters that set out to achieve something and actually achieve that something are a lot more interesting and very inspiring. Also, this is an important trait to show in role models for little kids.
The most popular songs - though not always the best - are what I like the call the princess songs. This isn't just a song that is sung by a princess, its the princess's song. For an example, Cinderella's "This is Love" is sung by Cinderella, but "A Dream is a Wish Your Heart Makes" is Cinderella's song.
SPOILER ALERT! Recently, I watched the new Disney movie Moana, and I absolutely loved it. The movie has a lot going for it - a strong female character, no yucky love story, and a plot twist that even my I've-been-watching-these-movies-for-fifty-years mom couldn't predict. The soundtrack was amazing, and the actual songs? They were the perfect blend of character development and plot advancement.