We brought our friends for the first time last year. This was our first trip with our kids too. Here's what made it magical for ALL of us:
We had ADR for CRT breakfast for the very first thing on the first day. So we were already all excited about going to MK, went to the castle first and were impressed with the theming. Of course, the girls loved the princesses. Then right afterwards we went to Mickey's Philharmagic which seemed to be a perfect followup. After that we went on Cinderella'a carrousel before going to all the other stuff. As much as my kids love philharmagic, I absolutely loved it, and aside from Fantasmic at MGM (another must see, and a magical thing too), it is my favourite! For us anyways, these things all combined just built on the excitement and magic for both kids and adults. Make sure you catch Spectromagic (evening parade) and Wishes (fireworks) too. Have fun!