I've never had a problem with the bus service at AKL. Magic Kingdom is a bit of a ride compared to the others, but just take that into account and you'll be fine!
If you want to get between Jambo and Kidani make sure to take the free van transportation, we didn't know about it the first time we went over lol
If you want to relax at the resort one night, I highly recommend Victoria Falls right above Boma. The drinks are great and the food I had while I was there was also great, though I've heard they've increased the menu you can get while there. Sanaa's lounge is also amazing and very quiet