Welcome back Grace! I am glad your sabbatical was not too long.
I did not think of myself as being intelligent for making the decision to only have two children, but I will take that compliment from you! I came from a family of four children and even though there were advantages to coming from a large family, I felt having two children was the best choice for me and my family.
While I didn't want to just experience one child, I also didn't want to have more than two because it wouldn't be fair to them or me since my wife and I have such a busy schedule. Also, we had both boys really close (17 months apart) so now they are best friends! I love to see how their relationship grows and how they rely on each other so much. I don't think they would have that if we had a third or fourth child. Also, my wife and I started having children late, so that was another factor.
I agree that the less children one has, the more time they get to spend on those kids, which is better for everyone all around in my book. Just like in school, a child benefits from more individualized attention and can progress more and possibly lead a richer, fuller life.
I look back on my childhood because we were like this tight knit unit that worked together. I laugh when I think back about us being crammed together in that small house trying to work around each other and getting under our parents feet. But for me, the decision to have a smaller family was a no-brainer and I never regret it!