There are two stops at AKL, the Kidani building and the Jambo building. For parks, buses run Kidani to Jambo to park, for Downtown Disney, Jambo to Kidani to DD. The DD bus also stops at Typhoon Lagoon when it is open and the studios bus at Blizzard Beach. Some chance of having to stand during early morning rush if you board at Jambo and some chance for the same when returning from park right after MK fireworks, Illuminations, or Fantasmic.
I have found buses at AKL to be fairly reliable and better than others. Run to AKL is about 10 minutes, run to other parks about 20 to 25 minutes once you are loaded at the resort, more when water park is a stop.