Driving will be faster, maybe not to MK, but maybe so. Everywhere else driving will be faster.
When we had a car with us in 07 we drove to TL, DTD and AK, took the bus or monorail (from CR) everywhere else, including AK the second time. Didn't mind the wait, and the driving was someone else's responsibility. We also don't have to worry about strollers, wheelchairs, etc. it was me DW and our two teens.
Did miss the car for DTD and TL when we went in 08, but not for anything else, and it wasn't bad even to DTD and TL.
So the short answer is - it depends.