we used it at all the parks and although at mk you had more of a walk, we preferred it since we didn't have to fold up both strollers to get on the tram.
i thought it was well worth it at all parks and i had recommended it to a friend and that was the first thing she thanked me for when she came back.
bottom line, if you have it, use it. you can always go back to the regular parking lot if you're not happy.