I honestly didn't think that I'd see that kind of story would be done so soon. Nor would that story be hugely successful. And nor that that story would come from, of all places, Pixar.
My first thought upon hearing "Finding Nemo" would spawn a sequel called "Finding Dory" was the same as everyone else's - "Really? A sequel? Can't Hollywood come up with anything original?" It doesn't help that most sequels to movies tend to do nothing but spout the same story as the original without the original's magic and with nothing new to say. Even Pixar isn't immune to this rule: the sequels for "Cars" and "Monsters Inc." fell flat in comparison to their predecessors. And whenever a sequel happens to be good, it's because it expands on the first film and has its own story to tell.
"Finding Dory" succeeds for those reasons indeed, but it does something more. It tells of living with a disability and all the complications and strengths within it. And it did something that very few movies do - it made me profoundly relate to it and sob by the closing credits.
Why? To explain, there will be spoilers from here on out.