It wouldn't normal be busy around then, but it probably will be busier this year as two new rides will have just opened. But whether that will make a huge difference to queues for the shuttle bus at the airport, I have no idea.
The price for the VEA shuttle bus would be 45 euros each way, while a private shuttle would be about 70 euros each way. Obviously the private shuttle would be easier, but would it be worth the extra money to you?