I've been playing racing games with a wheel and 2 pedals for year. Always instinctively used left foot braking, I didn't know there was another way.
The day I got in a car for my driving lessons, I didn't think ONCE about left foot braking. Didn't even got into my head. Only because I read about it here on the forum, I tried it (on a straight empty road), only to notice I suck at left foot braking in real life and there is no need to do it.