Ask HN: Anyone using a markdown file based CMS for more than a year?

Does anyone use a flat file-based CMS for more than a year? How have you dealt with all the file in time, with scaling? Has performance degraded through time?

I want to start a new blog and I don't want Wordpress or related CMS. I would love to try flat file based CMS but I am worried about scaling and other issues that might arise through time and growth. So, what are some of the challenges that you faced with time and growth?