Many of us learned heel toe techniques back in the day when autos were very inefficient and hand brakes even less so (and a hill start was required). I learned on a car without synchromesh on first gear so balancing accelerator/brake with the same foot was essential.
I now drive a mixture of autos and sticks and I don't even have to think which one I'm in today, it's all (erm) automatic. But paddle changes I can't get on with, even when trying to drive quickly. They're just one more gimmicky toy that salesmen boast about but you never actually use in real life along with the dozens of other options buried deep in the menus.