I do too. I love math and look for opportunities to do math in my head. Geometry for building coops and such, algebra also helps for getting the most use out of standard board sizes. Slopes are easily calculated also.
My complaint about modern math education, and education in general, is that it doesn't encourage our children to think things through on their own. There is no "right way", as long as your way provides the correct answer. I remember chafing as my math teacher took points off, not because the answer was wrong, but because I didn't show enough steps in my work. I devised shortcuts that let me skip a lot and I had to explain my logic to her before she'd give me full credit. I was a challenging student to have in class, I didn't "fit" any of the patterns that they had been trained to expect in their students. Because of my bad experience in school, I chose to home school my kids and it avoided all that and allowed a very customized education. It is great to explain just a little to a child and watch them comprehend on their own, human brains are amazing when properly challenged, but I don't think that's a consideration on modern education.