No, banking the turns allows you to take the turn faster without skidding. The faster you take the turn, the more "G force" you experience. When the car is banked, so is your body (head tilted inward, legs outward) which results in the G forces pushing your blood toward your legs, and you get tunnel vision, dizzy, and can even blackout if the G forces are too high or last too long. This can be ameliorated by making the turn radius greater (in other words making the turn less sharp), but that would mean a longer track.
Fighter pilots wear special flight suits that inflate and squeeze their legs and lower body to keep the blood higher up in the body and help prevent blacking out when they make insanely high speed, sharp turns.
Its similar to (but worse than) what happens when sometimes people suddenly stand up after laying down for a long time and get dizzy (or even faint in extreme cases).