We always take a car, and always drive around property. The property signage is pretty good for major things like the parks, but we have found through the years that they mark exits much differently than they do at home.
Specifically, we are used to not only getting a heads up that a turn is coming, but also another sign at the turn itself. You may only get one of those signs on WDW property.
It makes sense I guess, because there are so many places to go there. But it is always a good idea to have a co-pilot to help you watch for turns.
And, parking is free for Disney guests, so we take the car to most places. I abhor the buses and will avoid them at all costs.
I think the worst signage is to get OUT of the parks! Seems like they really want to keep you there. :laugh: