We usually rent a car because we shop for groceries. Also, we have been known to have fast passes for later in the day and ride rides we want mid-afternoon. Leave and go wait for the bus (which seems to take longer later in the day no matter which resort you are at) go swimming, eat dinner and then drive back to the park that we have fast passes for and use them and catch the closing fireworks if it is that park. Usually if you are going back to a park at evening or night such as HS or EPCOT, many cars have left and you can park right up front and don't have to worry about trams. We have been at SSR , in the pool at 7:35, driven back to our room, dried off and changed, grabbed some food and been back into EPCOT for Illuminations with a really good viewing area by driving the rental car. (Buses would have taken much longer for this!!)