Whether or not older kids will be bored at one of the kids clubs depends on your kid, which club, and the luck of the draw. My older DD has always been comfortable with youger kids - she's a big sister, and loves playing big sister to other kids. But as luck would have it, when they were 11 and 8 they went to Neverland, and there was another 11 yo girl there with the same birthday! They hit if off and had a great time there together!
Neverland is really cool, btw. Mouseketeers at GF stinks (not literally), and I'd say it's not worth the money, especially for older kids. You get a little box meal, and it's small and not themed very much. They have supervised crafts, and plenty of video games, and they show Disney films, but even my 8 yo was bored.
Neverland is bigger and has a small buffet for the guests. The reception area is themed like the nursery, and to get into the play area, you "fly" through the nursery window, and the other side is themed like the sky over London!
I've never tried or even visited the other three, but I've heard that Neverland is the best one.
Good luck and have a magical trip whatever you decide.