Hi!! I'm sure you're excited to be planning for your trip!!
We stayed at ASMo last week, and had so much fun!! We were very pleased with the buses. They seemed to arrive for the various parks about every 10 minutes or so. There was only one time when the wait seemed very long (probably 20 minutes) for MK.
As for sitting through a tour, they don't really do any type of tour. It's just a very peaceful ride along the main streets of Disney. You can see some of the resorts along the way, but you don't hear any spiel about them.
Enjoy your visit!!