I was at SSR 12/4 to 12/12 and didn't have major problems with the bus system. One day we waited over 40 minutes for an EPCOT bus (when we had dinner reservations, of course). It also happens that it was about the only time a cast member wasn't at the Grandstand station. I told the driver about our wait and he said, "It doesn't surprise me. I have been stuck in traffic." Stuck in traffic? How much traffic is there between EPCOT and SSR?
Well, the next day my folks and I were the only people on an afternoon bus bound for DHS. So I talked with the driver. He said that buses receive new orders after they complete one circuit. So, he went through SSR and took us to DHS. As soon as he would drop us off he would get orders to go somewhere else intirely. He said sometimes they are asked to do the same route twice, but dispatch is VERY appologetic about that. Drivers also work 4 hours, then get an hour off, then drive the next 3 hours. He loved his job and recommends it to anyone (of course if I remember his name and put that on my job application he gets a $500 bonus).
Anyway, all my waits were 15 minutes or less at SSR during this time (except the one EPCOT bus). Not bad at all.