Cathicool -- I agree with you, I think car rental is best, especially if you can get a good deal.
My hubby and I *just* returned from
Disneyland this past weekend (for the Half Marathon) and we took the Disneyland Resort Express shuttle. The shuttle itself was fine but man it was a pain in the behind to "pay" for.
We had purchased vouchers from Get Away Today for $23 round trip per person but we bought the vouchers too close to the trip that they couldn't send it to us. Instead, Get Away Today faxed our vouchers to the Disneyland Resort Express and told us that all we had to do was give the ticket agent our name and they would know we've already paid. That was not the case. Upon arrival to the Disneyland Resort, the ticket person came aboard to collect vouchers and payment and he had no idea what I was talking about. The same thing happened on the return trip home. Eventually it worked out in the end but it's not worth the hassle.
NOTE: I called both Get Away Today and Grayline on our arrival and departure days to confirm that our vouchers were faxed and received and both parties confirmed. Not sure where the disconnect was -- the information never made it to the ticket agent on the bus.