The couple times we've gone we've always had a car, but for the most part it does just sit there, but we do go marketing, have to hit In'nOut, character warehouse, target, trader joes, etc.. Since you are dropping off and picking up at different locations, it will cost alot more to rent a car, but check it out, and like other's have said there's the cost of parking at the hotels (does HOJO's charge?).
If I were you, I'd check out the cost for the rental (try different companies, I always seem to find Dollar the cheapest at out of LAX), factor in gas, and any parking charges, then check out the cost of your airport transfers for all of you and see what the difference is. If it's not that much difference I'd go with a rental car as you never know when you might need one and it is nice to have. For me, I hate the idea of being stuck somewhere, drives me crazy just thinking about it. But then again, you'd be stuck at
Disneyland, so no better place than that to be stuck

LOL
If you don't do the rental, I highly suggest ordering from Vons, you'll save so much money by getting a couple cases of water, juice, milk, cereal, fruit, snacks, etc.
Hey, I just noticed we are both from Hawaii

Get the car and go to Trader Joes!!!
