Every child is different. I mean, the pre-teens/teen years can be very tricky for families with those children. Sometimes, one visit is enough to for one to enjoy it countless times afterwards or enough to turn away. For others, it may take multiple visits to truly enjoy WDW and some don't really enjoy it unless they try a different experience. (i.e. Emphasis on dining or rec activities.) I'm not a parent but from personal experience, there was once a phase in my life where Disney was just not that interesting to me. Not because I loathed it or anything but other interests were emerging and from a vacation standpoint, my family wanted to expose me and my siblings to other places in the world. In all honesty, I really didn't really appreciate WDW until I was older though it did help that my interest in Disney was revitalized (Not just the parks, but their classic movies and such.) I would think if it's nothing but theme parks, the joy factor may not be very large for your 11 yr old though rides on Tower of Terror, Rock n Roller Coaster and Everest are just some exceptions to that! But if you do include something different like a recreation activity and such, that would probably help. There's a lot more WDW offers than just the theme parks! As for your 5 yr old, that's a pretty good age I think to bring your kids to WDW. They can interact better with the characters and they'll remember it better but as I said in the beginning, every child is different.