We never sanitize either. From the time my kids could sit up on their own they were sitting in the tops of grocery carts, and we never sanitized those - the kids were fine, no nasty bugs. It wasn't until my kids started going to preschool and being exposed to other kids' germs that they really had several colds/viruses a year.
Not only do we not sanitize, but we walk in and out of our house barefoot, hence tracking dirt from outside to inside. We have been known to climb up on the bed with dirty feet (gasp!) - yet we are all pretty healthy. We made it through the summer with no illnesses for me or DH, and 2 kids with a mild throat thing that passed quickly and did not require a doctor. I think that is a reasonable level of health to have, and I don't plan to change my ways.
I am actually in the camp that believes that germs are a necessary part of life, and we should only be making efforts to avoid contamination with really awful bugs from raw meat, undercooked food etc. No-one in our family has ever had a serious case of food poisoning, so we seem to be doing OK so far. Our bodies become accustomed to the germs that exist around us, and most of them are actually beneficial to us. It's only the occasional bacteria or virus that overwhelms our bodies, and truthfully, if our immune systems are strong that happens less and less. Sanitizing does not help our immune systems become strong (strong immune systems require many antibodies, and antibodies are only created through exposure), and since there is no way to be sure that you have sanitized every last germ in sight, when you do get exposed to a nasty germ, you will suffer much more than those with hardy immune systems. That is my *personal* belief, however, though it is somewhat backed up by research. And there are exceptions to everything, of course - everyone has stories. I just think that a life without sanitization can be (and usually is) a healthy one, provided you follow some basic hygiene (not suggesting that everyone live in a real dump!).