We had the same problem last year at CBR....perhaps you were there in Septemeber??? It was horrible, we were late for ADR's and we were at the bus stop at least an hour before our ADR. We waited 2 hours one day for a DHS bus that somehow kept missing our stop...but that's another story. We are gonna forego the cab and just rely on the Disney Transportation and hope for the best!
As a warning...I screwed up an early ADR at HS when we were at BCV. Our reservation was for 8 am and I assumed we could take the boat. The buses stopped running at the hotel (according to the CM's) and there was no boat for an hour. So DH and I had to push the strollers over to HS to make breakfast in time. It all worked out but I just wanted to warn folks that make sure you know about the boat service if you are planning on it....