I have stayed at the Doubletree by Downtown Disney whenever I travel to Orlando for business. It is a great hotel and you get plenty of room in the suites to accomodate your family. I have found that the staff is very friendly and helpful. I ate at the breakfast buffet the last time I stayed there and it was good enough, nothing spectacular. It was too cold to use the pool at the time, but it looked well kept. The fitness room is top notch and has everything you will need. I never used the buses to the parks (yes, I go to the parks when I am there on business), so I cannot comment on that.
And of course, there is that tasty cookie when you check-in.