Wow, I was in the exact same situation myself! I tell you what you've got to do.
Pixar.
Kids love pixar, no matter how much they love that tween stuff, Pixar still reigns supreme. I'd be very surprised if you pulled out Toy Story or The Incredibles and they didn't want to watch it. And, they're very good films in their own right, so you don't have to subject yourself to crap!
Well, it might not work for you, but it did work for me. They were getting me to watch that Hannah Montana show thing, and I asked them "How many times have you seen that? Would you like to see something new?" because I knew they hadn't seen Finding Nemo. So I put that on. Them happy, me happy.
But yes, Disney films these days (Excepting the mighty Pixar) are going downhill, fast. I doubt we'll be seeing another Jungle Book or Fantasia level of quality for quite some time.