Of kids I've always thought "maybe one day". I can see how it'd be a tough, but extremely rewarding and meaningful endeavor. But reading this article made me think for the first time "actually, I think I don't want kids." So many "mental CPU cycles" spent learning about pregnancy, babies, why they cry, how to care for them. It just doesn't appeal to me at all - I think it'd resent it taking me away from spending time…
How's this for a rule of thumb: if you can be happy without having kids, don't have kids. They're very hard work, expensive, and often bad for your mental health. But, if like a lot of people you know you will always be sad if you don't have kids, have as few as you need to scratch the itch.