The popularity of "Let It Go" among the kiddie set reminds me so much of "Part of Your World" from The Little Mermaid. I was about Miriam's age (8) when that movie came out, and I remember my mom taking me to see it in the theater, and then obsessively listening to and memorizing the soundtrack over the next few months. To this day, I love that song. It's so easy to fall into singing it; a simple "Look at this stuff. Isn't it neat?" will do.
It's clear to me that "Let It Go" is this generation's "Part of Your World." Do you agree? It's not as easy to sing (the vocals of that bridge section with the "frozen fractals" always gets a little wonky in our house), but the emotions are the same.
I know there are a million "Let It Go" videos out there, but this one is my current favorite. Enjoy.