The bus stop order for the theme parks/water parks is bus stop 2, then 3, then 4, and lastly 1. If going early I would use Bus stop #2 which is by the preferred Casitas area, guaranteed a seat, because early morning is the most crowded. Another reason we rarely do RD anymore.
We rarely have issues with buses and we take them all the time. We drive to WDW and still would rather take WDW transportation. It never bothered us at resorts that have multiple stops, our family is normally talking about the park we're going to and most of the time rarely notice the stops. It really depends on the person. Have a magical time