I didn't vote, but all of mine are close (between 19 months and 28 months apart). I really like the close spacing - my two girls (19 months apart) have played very very well together since the youngest was about 12-13 months old and on her feet.
In my family of origin, Mom and Dad had 3 of us in 3 years - hectic, but she loved it (once we were a bit older!). Then they waited another 4 years to have another one. I love my sister to bits, and she's wonderful, but I would never do that. She found it difficult growing up, seeing all three of us doing things she couldn't do, you know? And because of the large age gap (she is 7 years younger than I am, since I'm the oldest), we didn't start getting to know each other until we were adults - which is something I regret.
Just one perspective! I think it would have been easier on my sister if there had been another child right after her, you know? Then she wouldn't have felt so left out of the 'older kids' stuff.