We just had a CRT's ps for 8:20 this past week. We had our car so we drove to MK and got first row parking! At 8:00 am they start running the express monorail straight to the MK so we hopped on it and then looked for the sign on the left for early priority seatings entrance. It was a snap and so worth the walk down Main St - practically had it to ourselves. And then since the park doesn't open until 9:00 we practically walked onto all the Fantasyland rides after breakfast, very cool!!
We did the same thing last November with the excpetion that we arrived prior to the express monorail starting so we took the resort monorail over to MK. It took a little more time, but not much.
They do run character breakfast buses as well. Not sure when they start running and if they drop off at all the parks or pick up for each park.
Have fun!!!