There is a transportation map available at WDW that shows you how to get from any place to any place. However, it's not very good. For some reason, Disney doesn't seem to want you to use transportation to parks unless you're going to that park, so they always recommend going through DD. That can be really out of the way for some routes.
You should be very happy with the buses. They come and go continuously. The waits can be a little longer when the demand isn't high, but you'll never have to wait too long.