We stayed in the cabins last October and absolutely loved them

was the best decision we made, choosing to stay there.
I cannot comment much about the internal Bus system as we hired a Disney Golf Cart, but the external buses ie to the Parks and the Boat to the MK was fault less, I have heard negative opinions though too on the buses so I think it may depend on how busy that particular time of year is when you travel.
The only negative, be it minor was the lack of storage in the actual cabin, we are a family of 6 and struggled with all our luggage, this may have been added to due to us staying for over 3 weeks
However it cant have bothered us that much as we have booked again for this coming October

and having previously stayed at various other Disney Hotels ie AKL this is the first one we are returning too.
The whole relaxing atmosphere, the wildlife, the sun first thing in the morning on your decking whilst eating breakfast

loved it, loved it, loved it.
You may want to try doing a search on the Disney Camping forum as there are stacks of posts on there relating to the cabins and the campground from the contents of the Cabins to the Campground and all what it has to offer ie campfire singalong with Chip & Dale, Mickeys BBQ etc.
Feel free to ask me any further questions who may have