Everything about how Apple chose to introduce Home Screen customization (and teach people how to use it) really captured what Apple gets and so many people completely miss.
Clear instructions, followed by the icons going from dormant to “wiggly” is just an excellent example of a well-executed, playful user experience.
This action gave me the same satisfaction I got the first time I experienced the "Slide to Unlock" (which incidentally was what sold me on this little bugger)



