We have visited AKL several times, staying at the resort and visiting to see the animals and to eat at Boma's. I just don't recall any significant waits at all.
I have never stayed at the Dolphin but have unfortunately experienced the bus that goes there when I stayed at Beach Club and Boardwalk. I would have to say that overall the shared bus service at these resorts is the only consistently negative part of any vacation I have had at Disney. It seeems that we always have to wait and wait to get a bus to the parks, and heaven forbid you actually want to leave MK anytime near closing, as there are always a couple of busloads of people already waiting, and waits between buses, then it just seems that the trip back to the Epcot resorts takes forever and everyone is packed in like sardines. I really don't like the bus service to and from this area.