An acquaintance told me that it's much faster to drive from our resort to all of the parks except for Magic Kingdom. She said we'll park in the north 40 and walk for 20 minutes if we drive to MK, while the bus drops you at the entrance. Is this really the case? That we're better off driving (since we're staying on property, parking is free, right?)? Should we take the bus on MK day? This is our first trip ever to DW. Leaving in 9 days!