Queues will be no problem with a bike. To be honest its not too bad in a car.
Not sure about parking tho', I don't know if they charge. There are always masses of bikes parked out the front of the main entrance, but you should have no problem getting into parking areas as you can usually buy tickets at the point of enrty (if there is space), it will be tricky getting into camping areas tho' as these are all ticketed in advance. You could always call the ACO, they are pretty helpful these days.
