I've driven both, and you can use heel-to-toe on either. It's where you use your left foot for a moment to control both the brake and the accelerator. I've had to use it a few times.
But if you're driving an automatic, it shouldn't be so much of an issue. Automatics have a torque converter that never completely disengages when you come to a stop (unless you shift it into neutral), so rolling back shouldn't be a problem. At least, it's never been for me, and I've driven in lots of hills.