Put a radio on in your bathroom, turn the shower on and the lights off, and wave a laser pointer around. Bam, it's fantasmic!
You forgot something very important: In the middle of the show, out of nowhere, watch about twenty minutes of "Pocahontas".
OK, seriously. If there are kids too young to appreciate a leisurely three-course meal in a posh restaurant, do not even think about taking them to Brown Derby. We saw a dinner package family who had dropped serious cash on BD and their children -including one who could only be described as a very freshly born person- hated every minute of it.
As far as the seats, they aren't terrible. Your seating area is chosen for you, but you get to pick exactly where you sit, and if you stick near the middle you'll be able to see everything important.
Now as for the show... Here's my plot summary:
Act One: Mickey doing Mickey stuff
Act Two: So, Disney movies, right?
Act Three: Aforementioned big long Pocohontas segment for... some... reason...?
Act Four: Random assortment of villains (including Malificent and, er, Cruella DeVille) show up and chuck special effects at Mickey.
Act Five: Mickey is all like, "My imagination is the most powerful thing in the universe! It's even stronger than Chuck Norris!" (Well, no, but that would have been the cutest thing.)
Grand Finale: Mickey doing Sorcerer's Apprentice stuff, as advertised in the promotional material