Great question! I have 13 snakes (17 including my brothers), and they are all taken care of as well as when I only had one. I'll be honest, I don't handle them nearly as much, on an individual basis, as I used to. I still do find the time to handle them though, and I think it is actually very important. These snakes are first and foremost pets, and I like to be able to handle them regularly, or let others hold them, without the fear of getting bit. Some people say they are not social, and thus require no handling, but I don't find that to be true. They are of course solitary by nature, but they without a doubt become more social with gentle handling. I feel comfortable handling anyone of my snakes, and that is very important to me. Each have their own personality, but they have all come around to accept, and even enjoy handling (no anthropomorphic insults either).
To some, they may not feel the need to handle them, and they are correct in saying that snakes don't "need" to be handled. But as pets, and animals that I like to be able to show to friends/family with confidence, I think it is important to get them used to handling.