I disagree. We had ten people in two cabins and a nearby campsite. One person was age five, two were in their 30s, we were in late 40s, the rest were older than 75. We didn't need a cart at all. We didn't wait longer than ten minutes for any bus and even if we had to take the internal one to another bus or the boat to Magic Kingdom, we had a good time with all that.
To us, part of the charm of the Cabins and the campground was the ability to slow down and enjoy nature and each other. That was one of our best trips ever (I've been over 50 times) just because of that fact. And spending $50/day just because we couldn't take another 30 minutes of our lives to get somewhere seemed like a waste to everyone. Especially since we were on vacation.