I use my smart phone for pics most of the time but if I'm riding somewhere scenic I'll pack my S100. The picture quality is noticeably superior to both my phone (Galaxy note 2) and my wife's iphone 5. And I can use it one handed while riding.

I have to admit that I'll put it in a little bento box when i plan on using it. I just don't want to sweat all over it. my phone is always in a ziploc in my jersey so it's a hassle to get out while riding and I would cry bloody rivers if I dropped it and broke it while riding. Cameras are cheaper, usually sturdier and also lack a contract.