And I said I appreciated your opinions, which I did indeed ask for
Without wanting to digress into a "how to drive around bends" monologue, you should generally enter bends slower than you exit them. Using the accelerator rather than the brake when driving through a bend typically leads to the car being more stable, especially for rear wheel drive cars (which mine predominantly is). I'm afraid I can't recall the exact microseconds, but I expect I would have been accelerating as I unwound the steering out of the last bit of bend as the road opened in front of me... except at that moment I saw the horses and applied the brakes instead. I would never by default be on the brakes coming around a bend - braking and steering is not a clever combination, especially in the wet. But let's not forget this is not a tight bend - my hands might have moved to 2 o'clock or something and back?
It sounds like we both drive these same sorts of roads then - perhaps we drive them at slightly different speeds sometimes but it sounds like we're both doing so safely (you may disagree with that). I don't need to be exiting corners at 40mph, you're correct. I could simply walk everywhere - as could you. But that's a silly line of argument for either of us to be making so let's not go there.
In over 20 years of driving - and almost all of that in rural, countryside locations - but quite often busy ones - this is the first time anything like this has ever happened to me. That tells me I could be anything from a crazed lunatic who's been very very lucky, through to a very careful driver who has just happened across a crazed lunatic on a horse. I suspect the reality is somewhere in between, but hopefully nearer the latter than the former