I have been on the Keys to the Kingdom Tour at MK. It was amazing! I felt like it really enhanced the magic to hear about all the details that go into making the park perfect. I also did the Segway tour (not a behind the scenes) which was a lot of fun. This next trip I am deciding between the AK behind the scenes tour and the full Backstage Magic tour. Just not sure if that one is too repetitive of the KTTK I already did.
BTW, allearsnet has great reviews of the tours if you want to read more about them. JJ