I'm another of the didn't-go-as-a-kid group. My first trip was at age 40 and I unashamedly hugged Mickey and posed with his pals, and though we didn't do a lot of character meets I was thrilled every time we spotted them throughout the parks.
Yes, of course I know the characters aren't "real." But I also know that Expedition Everest's tracks were deliberately built to look torn up, that the Yeti isn't real, that I'm not really helping Buzz fight Zurg, that my hitchhiker at the mansion is a special effect, and that our country's presidents are not really assembled on that Hall of Presidents stage. It's all a show, and you can choose to either be an observer or throw yourself into it. Nothing wrong with either approach, but I think there's more opportunity for magic when you do the latter.
My two favorite moments from my first trip were from "for kids" moments. The first one was on Dumbo...I wanted to ride because it's a Disney classic, and my Disney veteran friend humored me. Well, she hadn't ridden it in years and remembered the "flight" option as having a very sluggish response. We're in our Dumbo, the ride starts, she moves the switch up and ZZZZIP! Up we went! She was so startled she screamed then we spent the entire ride at the top altitude because we were laughing too hard to run the control again.
Second moment was sitting at the UK Pavilion in Epcot watching British Invasion. Space was at a premium and we ended up sitting on a curb near the band but facing away from them. We realized we were facing Pooh and Tigger's greeting area when we saw first Pooh and later Tigger peeking out the window at the crowd. Most had their backs to them, but I waved to Tigger and got a thumbs up and a Tigger bounce in return! It was a tiny little interaction that my inner child was thrilled by.