I was in exactly this situation. I had a static site/blog thing on GitHub pages, but the process just wasn't conducive to spur of the moment writing. I nearly went back to WordPress but it's just far too bloated for my needs, so like you I ended up on Ghost. I went with Ghost because it was nice and streamlined, made writing quick and easy and wasn't too bloated. I still need to take some time to develop a super streamlined theme but it's good enough for now!