The second I read the details for Carsland at Disneyland, I had already started planning a trip out west!! We are HUGE Cars fans here and it's a must do for us. No "someday," no "maybe," no "when we get the chance." It was "we are going...I don't care how much it costs!"
For us, a trip to California involves a long cross-country flight. That is not cheap. The flight itself is not much less than our entire Disney World package for this year, including resort and park passes for 7 nights. (We got free dining, so technically the $2300 includes food too.) But yeah...I priced flights and for the four of us, we'll be lucky to do it for $2000. We will most likely fly home from Las Vegas, which should save us about $400.
So yeah, our vacation will include a night in Vegas. And a night in Hollywood. And a couple more nights in So Cal, in addition to the 5 nights at Disneyland. If we're flying that far for that much money, we're sure making it into a grand vacation!
In the end, the trip will cost almost double what we pay for a trip to WDW. It will be longer though...11 nights versus 7. And we have to rent a car for the second half of the CA trip, which is something we never do at WDW. But I know it will all be worth it to walk down the street in Radiator Springs!!