So sorry you're having these experiences. I can assure you that Disney is not just for the little guys and gals.
My dad took me at age 12 (my sis was 8.) We feel in love with Disney! We went back when I was 16 after years of begging. What was cool was that after the trip when I was younger, I switched schools and one of the first friends I made was a kid that went to the world every year. We didn't end up becoming super close, but we chatted a lot after that trip. In high school, I had a friend become obsessed with the whole hidden Mickey thing. He complied a HUGE notebook for me of tons of them that he had found on his recent trip, as well as from some internet research....and this was back in the days of AOL and noisy modems.....lol..... So, there were older kids that loved Disney, too.
My Dad became a big Disney world fan, too. He was such a big kid. He planned our itinerary to the minute....read all the Disney guides....Everything. it hurts that he passed away before being able to go with his son-in-law and grandsons, but every trip back is very special to me because those trips remind me of him.....the parks have obviously changed, but I can still picture him in certain areas or on certain rides.
And then there's my hubby. We are thirty-somethings with kids, and his first real trip was not until we had a baby and traveled with a large family group about six years ago. Actually, his first Disney experience was in Epcot for a few hours after the group we were traveling with marched in the parade. It was hot, crowded, and we had little money as college kids, so he really didn't get to see Disney magic. But after those real trips, he totally gets it. He understands why it might cost more than just any ol' theme park. He sees the quality of everything and the incredible customer service of the cast members. He sees the magic, and good grief, my big, strong, military hubby was moved to tears a few times on our trip in 2011....just thinking about being there with his family and making some sweet memories. Don't tell anyone.....lol.