Ah it makes me so excited some people approve!! Are there any attractions we JUST CAN'T miss. I secretly think we are getting engaged some time during the trip....fingers crossed.
Oh geez...there are so many "can't miss" attractions for me! But since you are doing a shorter trip and it's your first time, I would say try to do as many of the "big attractions" as possible. That's a relative term, but by park I would say:
MK- Space Mtn, Splash Mtn, Big Thunder, Pirates, Haunted Mansion, Peter Pan, Dumbo and probably Pooh for your son. If you find more time then I would branch out to some of the other rides.
Epcot- Soarin', Test Track, Spaceship Earth (you have to go in the big "golf ball" on your first trip), Nemo (good for Mike). I also love the two "rides" in the World Showcase, Maelstrom and Gran Fiesta Tour, but you might not fit those in, but definitely do a walk through the World Showcase, it's amazing!
AK- Everest, Kiliminjaro Safari, Jungle Treks, Kali (if it's warm), Dinosaur! (if you're ok w/ bumpy rides), It's Tough to Be a Bug (if Mike won't freak out about the bug stuff...this can be scary for some kids) and Festival of the Lion King. AK is a big park and it can take a while to fit this in. If you have more time, I would also visit Rafiki's Planet Watch, Dinoland USA and the Flights of Wonder.
I know this is a ton...hope it helps. I'm pulling for you on the engagement!