Sorry, this is not correct. The buses circulate through the resort, stopping in this sequence: Grandstand, Carousel, Paddock, Congress Park, The Springs (which is also the Carriage House). Then the bus goes directly to the park. No need to transfer.
And as with other Disney resorts, buses come roughly every 20 minutes, with emphasis on the “roughly”! In July, we did find that the screens at the bus stops were fairly accurate in terms of when the next bus would arrive, but again they couldn’t be counted on as exact.