It's really helpful at Studios. It parks you in the front lot, behind the bus area. Cross the tram lane, and there's a 2 person security check, and then you're right there. I find it a lot nicer than coming from the tram area.
MK is a joke when it comes to the prefered parking... the trams never stop at that lot unless they're using the dwarf side (party nights or really busy days). And that is a haul. I'd wait in line for three trams to get to my car than take that walk after a long day.
Epcot, I've entered from that parking lot before. With the new gate up, and the security checks on either side of the monorail, it's more of a haul. Before you just walk up to the turnstiles for bag check, and parking over there wasn't a hassle.
DAK, A lot of people tend to walk to their car. It's a hit or miss. If you have a stroller, it might be better to use it, so you don't have to take your little ones out to get to the car.
But if you don't like where you're parking, just pass by it, go through towards the exit and re-enter the parking lot. There's usually a turn around right before or after the toll plaza that puts you back with the flow of traffic. *guilty of doing that one a couple of times*