As Wanda has said MK takes much longer than any of the other disney parks to get to simply because the car lot is so far away. WH to MK car lot can easily be achieved within 15 mins, but the monorail/ferry can easily add a further 15 mins and quite a bit more if its opening/closing time.
As others have said the AK car lot is within 5 mins, and if you get there earlier enough the entrance is only 2 mins further.
Paul