There are pro's and con's to bringing a car. I did one program without one and one with one. I also drove all the way from L.A the second time so that was a fun car trip.
Anyways.. The busses do run on a schedule you may just have to leave an actual hour before your start time. As some busses make mulitple stops to either other complexes or work locations. They do run to the
WalMart on John Young Parkway which is in complex with a payless, hair cuttery etc. You would save money on gas and insurance. If you happen to have to work a special event like the One Mighty Party at the Studios till 3 or 4 am then you do have to call and wait like 45 min to get picked up. Also if the busses still share like one buss for Epcot and MGM then at night theres a chance you will be waiting to get on a bus cause it's full.
If you bring your car you would have to pay for gas and insurance, but you can go where you want when you want. You could always take the bus even if you bring a car. It's not like they say you can't ride the bus if you bring your car. Unless of course your a PI or MI and then you have to bring a car.
If you would like to go to the mall,beach, downtown Orlando you can do so without having to find a ride from someone. You will also make aot of friends because you have a car while others don't. Which means you can politely ask for gas money from them.
Grocery shopping is so much easier. Remember the bus does go to WalMart but you have to carry what you buy from the bus stop to your apartment. And your apartment might not be close to the bus stop. At night when you leave work you can actually leave work and not have to wait for a bus or run after the bus that is just leaving.
It's up to if you bring your car or not. I enjoyed having it but that's just me.