The simple truth is that dealing with young babies is way easier when they're in the same bed. When they cry, you can comfort them immediately, if you need to breastfeed, it takes about 5 seconds to get started. And they sell these nifty little divider things if you're paranoid about rolling over and crushing them, although as the article says this only appears to be a problem in practice if the parents are morbidly obese and/or on drugs/alcohol.