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I have always driven automatic transmission cars using my left foot on the brake pedal, at least most of the time. Yes, faster reaction time but also just less work, particularly in heavy, stop-start traffic.
I also occasionally do so in a manual transmission car, only very seldom while shifting gears though. While it is possible to shift without using the clutch and brake, I find it takes more concentration - for me at least - than I want to use on that. Much better to focus on hazard perception.
Simultaneously applying brake and gas pedal inputs can be used for car control/altering brake balance. The rally/race car drivers in the videos above may be doing that. It is most useful in FWD, slightly less so in 4WD, cars. Similar to pulling on the emergency brake (if it acts on the rear wheels - which most do).
I did half spin a few times while learning how to do it - and I still don't feel I do it particularly well.
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