I have found that many things I thought were awesome as a kid are actually crap (places to eat, certain foods, etc.) I've gone to childhood restaurants and it wasn't anything like I remembered. It could be the restaurant changed, I changed, or both. I think it's 90% I have changed. Example, as a kid I loved Pizza Hut. Now it makes me sick to my stomach just thinking about it. Worse when I actually eat it.
That being said, there are a few things I miss. Fajitas that Taco Bell used to have years ago. School pizza was pretty good as were the soft chocolate chip cookies. Also, I won't eat certain foods because they'll never be like how my mom made them. Cheese cake, canned peaches, chili, etc.