I’ve been wearing VFFs for, uh, fifteen years or so? Something like that? I think it might be a little more, I’m not sure now. I’ve also got a pair of VivoBarefoot hiking boots, and the Bellville MiniMil rough-out boots that end up being my utility shoes. The only times I don’t wear minimalist footwear is on a bicycle (I used SPD pedals), and on a motorcycle (I have Sidi Vortice and Mag-1 boots). I always wear socks with my boots, and always Injinji socks with my VFFs.
I’ve gotten so used to them that regular shoes feel very weird and uncomfortable.
You should be doing transmission service regularly though. Automatic transmissions are often claimed to be good for the life of the car, but regular drain and flush will prolong the life. Coolant flushes used to be more necessary than they are now.