In my opinion there is nothing better than the Disney Transportation system. Depending which Resort you stay at (Some have monorail and ferryboat service) there will be bus stops at strategic locations (usually no more than a 2 or 3 minute walk from your room) that will be the only place you need to go from your hotel room. Each bus stop receives service from every Disney destination you wish to go to. All the water parks are respresented, Downtown Disney is represented, as well as the Theme Parks. When you arrive at a destination (theme park, water park, or etc) you will be dropped off at a particular spot and you will be told which spot to return to in order to get back to your resort. Sometimes there are lines, but all in all they do a tremedous job and completely take the burden from you on having to drive or worry about parking or any of that.
You will be told when you check into your resort which bus stop will be closest to you.
As far as maps or cheat sheets go, I don't know of any. The buses generally make a pretty straight shot from resort to theme park (or whatever your destination) unless there is another resort on the way and your bus is still mostly empty.
I honestly prefer the buses over any other way to get around. It will completely take the stress out of getting around Walt Disney World.
Trust the Mouse!