I don't think you have to be a parent to love this article. People tell you in high school to enjoy every minute of your "glory days". They say in college that "these are the best years of your life." And certainly, they tell parents of young children that "it goes by so fast, enjoy every minute."
I think that we're just not able to live that way, no matter what point of our lives we're in. And hearing that this is as good as it gets only stresses the heck out of me.
So carpe diem, but don't think too much about it.