Having a child is such a wonderful and fascinating learning experience for all of you. Please know that you are the ultimate source of what to do. Follow your heart.
If you do not like the sound of his crying, it is because he is doing all he can to tell you he needs you and that he is scared. People who push the "cry it out" method do so because it makes things easier for *them*. It is never better for the child to think that he can not trust his mommy or daddy to be there if he needs them.
Read Erikson on Child Development and it may help you to understand.
When a little one is so very young, their experiences and their ability to communicate are very limited, and thus creates a frustrating situation.
Imagine that you are completely unsure of what is going on, you wake up in a place that you are not very familiar with, and you are alone. You have no way of taking care of yourself an no way of commuicating "I am scared" "I am tired" or even "I am alone and don't like it" except by crying.
If you cry and someone comes to get you or checks in on you, you then learn that no matter what there is a person in your life you can count on, that you can trust. Once you have built that trust in your relationship, you will find that your child will grow up to be a confident, resilient, compassionate person who knows he is loved and will be kept safe and happy by those who care for him. Of course he is going to cry to test you, he is learning, but once he figures out that he can trust that you will always be there for him, believe me he will stop.
I know this sounds a little harsh, but as a parent and an Early Childhood Education Teacher, I can only tell you that too often *our* parents raised us in traditional methods that made lives easier for the parent at the expense of the child. It wasn't because they were bad, or parents who do use the cry it out method are bad. They are doing what they have been told or taught is the way to raise a child. It is nobody's fault, it is just a matter of just learning a way that honors the child.
If he sleeps in the family bed, lie down with him until he falls asleep and if he wakes go back to him and comfort him until he goes back to sleep. Trust me, there has NEVER been a child who went to college and needed his mommy to go to sleep with him, he will let you know when he is a big boy and ready to go to bed on his own. Mine did at 2 1/2, but only after he had learned to trust that we would always be there.
If he sleeps in a crib, sit with him, hold his hand or rub his back until he falls asleep and if he wakes sit with him and give him all the comfort he needs. It isn't spoiling him, it is teaching him that as his mommy you are there to keep him safe and happy.
Sounds a little too labor intensive? Please keep in mind that as a 6 month old, he still hasn't made the cognative jump into realizing that he isn't part of you and that you are not part of him. Babies do not yet understand that they are not a connected part of the mother. So, of course he is going to be scared if he wakes up alone. If you woke up and half of your body was missing and you didn't know why wouldn't you be afraid too?
You are obviously a wonderful, caring parent who is already giving her son so much love...just keep doing what you are already doing well and you will have a happy, healthy child.