yes its all about finding a balance, asi have already said in the thead, but several posters have said on its only 10-15mins of crying for a couple of nights, for your children that may well have been the case, but i know of others ie freinds where their children have cried for 45-60mins and then still woken in the night and its taken weeks, not days only for htem to have to do it all again when their baby has been teething or got a cold etc. there have been trheads on here where people have said htey cried for 50mins one night, then 30mins the next night etc. i think that is a LONG time for a baby to cry, and i couldnt do it.
for the average child that is otherwise looked after, loved and parented well it probably doesnt make a difference, but for some it might in temrs of how they deal wiht stress as adults. its probalby one of those down to temprement/personality things, all babies are different, some will cope wiht it better than others, but you cant tell.
and i am not a martyr parents and my kids to have rules and consequences etc, but i do think they ARE only little for a short period of time, so we did what we could to get by, taking it in turns to sleep, co-sleeping, we even used a baby swing for one of the boys for daytime naps so i could do stuff with the others. we tried various different things, but didnt leave them to cry and they all got so that they would sleep all night in a bed in their own rooms. i feel happier knowing they got their without us leaving them to cry, my instinct (and dp's) was that we couldnt do that.
BUT if people ask me what i did, i will always say well this it was worked for us, but your baby is different, my sister has a 5mth old and has asked my advice, i have offered her techniques i used with the caveat that he is her baby and she will find what works for them.
i do agree with seeker that its for the parent and not the child, generally a baby WILL get as much sleep as it needs, it may not do it when its conveneient for you! but they do esp when very little sleep as much as they need, in my ds1's case that was NOT VERY MUCH! and now at 12yrs he still doesnt need that much sleep, its the kind of person he is, and i dont think that leaving him to cry would have made him sleep anymore, he would just have cried.