I seems somewhat obligatory to explain why you’re using Jekyll for your blogging platform of choice when you begin using it, so I suppose I should follow suit.
I’ve been using WordPress for years. I’ve never been a prolific blogger at all. I’m not at all sure that anyone cares what I have to say anyway, but it’s been at least a way to get some of what’s inside my head out of it. In every incarnation of my blog, I’ve always used a blogging platform of some type - I started on Mambo (pre-Joomla), moved to Drupal, and from there to WordPress - all self-hosted. I do have accounts at Tumblr, Blogger, and WordPress.com, but I’ve never been a fan of that lack of control over the site.
Really, the big reason I’ve switched to this is because it’s something new to try.