I'd say about 1/3rd of my class brought cars. The last couple of new hire FO classes have been too big for the Airbus training center's classrooms so they've been having class in the Marriott/Woolley's conference rooms, which are within easy walking distance of the Courtyard. The sim training center isn't but is a pretty cheap uber (~$10). We hitched a ride with classmates about half the time and ubered the other half and it worked out fine. If you can make the drive it's definitely worth having for the weekends if you don't decide to go home.