That said, when my dw was pregnant (with our fourth baby), I did sort of hope that she might have twins (she is a spontaneous fraternal twin, so perhaps her chances of conceiving twins were higher than average). Her acupuncturist wondered from her pulse if she was having twins, and I got a little excited about that idea. But it wasn't my body.
Really, I think one baby at a time is just lovely. And now that we have four kids, I think the benefit of having twins could really be replicated just in the fact that no matter what, another baby in our family would have a lot of siblings. The second year of twins is what I would dread repeating most. Yikes.
But, if, for some crazy reason, we DID end up expecting another set of twins, I would probably be able to come to peace with it. I do think it would be easier the second time around.