Just because you haven't had a dissenting opinion yet.
We seldom rent a car and when we do we tend to leave it parked. We find Disney transportation to be pretty good and where it isn't good (resort to resort travel, getting out of the park at closing time or even at park opening) we will take a cab. The towncar plus cab costs aren't too much more than renting a car (espcecially when you start paying for gas, tolls, taxes on the rental) and we don't have to deal with driving.
But, we are the type of people who don't like to drive. My husband enjoys driving, but only if he is driving a really nice car (and I'm not renting him a BMW! That isn't cost effective at all!). We get easily lost at Disney (other people don't, we must have a bad sense of direction).
Our home DVC resort is BWVs, so we can walk to MGM and Epcot faster than we can drive and park. It also means we are at "restaurant central" between the four hotels right there and Epcot and MGM - so we don't need to do a lot of resort to resort travel to be content with our restaurant choices. For the past half dozen trips, we haven't left Disney property, so we aren't eating offsite, going to Universal, or shopping at the outlet mall.
Our last rental car experience was such a nightmare. We spent two hours picking it up, were charged more than the quote and when we complained were told we could try to find another car, but good luck, most of the car companies were turning down people without reservations. They didn't have the carseats we reserved. Getting baggage taken care of was such a nightmare compared with baggage handling with a towncar service. I'd spend hours on a Disney bus standing before I spent another two hours in the pickup lot at the Orlando airport.