AoA doesn't share buses.
Don't know what you mean by "problems" getting a bus but you could have a bus pulling up right when you get there, or you could wait up to 20 minutes for one. I've waited about a half hour for a bus at AoA before. But that could happen at any resort. At peak travel times, the bus stops will be crowded and you may have to wait through multiple buses, but they often dispatch buses much sooner at crowded times.