Mare's milk is very yummy. I have no issue with drinking it
The issue I have is with the flying hooves and all the comparisons. Mare's milk is BAD for people, compared to cow's. Lower lactose, lower fat, and lower sugar is GOOD for humans, at least, adults.
And while there is data out there regarding all kinds of mammal's milk, including cats, dogs, and dolphins, I sincerely doubt that anyone commercially produces any of those products
Cow, goat, and rarely mare (and even rarer human... ewww)... that's about it. In all the time I've spent milking mares, none were bucking, rearing, and kicking. At least, those we were successful at. Some maidens need... encouragement... but that's completely understandable for a maiden mare to be very sensitive right around foaling time. A broodmare post foaling should have VERY little problems milking.
If you get the adrenalin rush from milking mares, find a new hobby... like bull riding.