Wow, touching stories here. Clearly, the choice of whether or not to become a parent is a deeply personal and very sensitive issue.
I always assumed I'd have kids some day, but I have never felt a longing for it. In fact, the idea always scared me a bit, but it also felt very abstract. I knew for certain that I did not want to have a child outside of a committed relationship, so I made sure I never became a single parent. When I hit 30, I gave the whole issue some serious thought, partially because I'd been talking a lot with a really wonderful guy I'd met online (yes, the early days before OKC et al), and he was paralyzed from the waist down. I decided that if we moved forward into a relationship, I would be ok with the fact that he could not be a father.
Well, that never happened, but I did eventually meet the man I would later marry. He was twice divorced, with two kids from his first marriage, and he had four stepdaughters in his second marriage, so as you may imagine, he had undergone a vasectomy during the second marriage because they were not interested in adding more to an already large family!
Again, I did a lot of soul searching when we were dating, and each time, the thought of choosing Jamie over some possible future child won out with absolutely no reservations. Funny thing though, is that he told me many times over that if I wanted to have kids, he would do whatever it took to make it happen. I honestly never felt like it was something I wanted enough to jump through all those hoops, especially since by that time, my age would have made me a strong candidate for a high-risk pregnancy.
This is all quite timely for me to ponder as a week from now, my body will lose its ability to carry a baby, once and for all. I've been jokingly saying, "please, take my uterus, I never used it anyway!" but it's still a bit emotional. It's a loss.
But, to the point of whether a non-parent can experience the fullness of life's experiences, I've got to say that's a heck of an assumption. None of us can know the depth and breadth of another person's experiences. What is meaningful and endlessly moving to one person can leave another person cold. I don't dislike children (I never would have married a man with two kids if I did!) but I never feel that "OMG I must hold that baby" feeling that many of my friends have. And I have quite a few female friends of my age (or older) who feel just the same as I do, and have remained childless as a result.
I don't think it makes someone any less of a full woman or a full person to choose a childless life. I would never judge another woman for her reproductive choices, and I hope I would be given the same respect.
ETA: I did think many times that I would be more interested in adopting a child than getting pregnant. I was obviously never into the idea so much that we pursued it, but the idea appealed to me.