I think it depends on a couple of factors: are you staying on or off property, are you planning or wanting to visit the beach or other locations that would require the car, are you traveling with kids and all the gear they require?
we don't rent a car for Disney trips. we prefer prefer buses and know that part of taking Disney buses is long waits/standing going to/from the parks. we also had a plan as for who was in charge of what during bus rides (traveling with a then 14 month old we had the kiddo, a strollee and backpack the beginning and end of the day and often times at the end of the day we had bags of souvenirs to contend with).
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