We are a family of 5 and just got back from Disney. We stayed 3 nights at the Cabins. Compared to most other options for a family of 5-6 people, the cabins are an excellent option.
My wife and I slept on the pull down Murphy bed and my 3 kids slept in the main bedroom with the queen size bed and the bunk bed.
With the kitchen table, full size fridge, stove, and microwave, it was a very nice place to stay.
We had no problems with the bathroom at all... except to have to wait in line.
I thought the internal bus transportation system was very efficient. It's easy, never really crowded (I was there in late July), and on time. A golf cart would have been fun, but not necessary. And, the cost is $62.50 per day to rent one. Others have quoted a lower price here, but either they just raised the price or they quoted me something higher because they thought I was loaded with big bucks. Regardless, we did not rent the golf cart and spent the money on something else.
We rode the internal bus system to the parking lot and then waited approx 8-10 minutes to catch the bus to Epcot. So, that wasn't too bad. On another day we took the internal bus system to the lake and took the ferry to Magic Kingdom. It's all easy.
Overall, it was nice. We are Disney Vacation Club members. We have stayed in the 1,2, and 3 bedroom vacation homes (which are still my first choice), but the cabins are probably the best bet for someone with a family that could use a little extra square footage to move around, have a kitchen, and be a very relaxed atmosphere.
Hope that helps,
Rich