I switched to Jekyll but it wasn't a fast decision. I really tried to give WordPress a chance, again, but I'm not getting along pretty well with PHP since like 2 years ago. In fact, is a headache to maintain on my server. In the course of the years I have had several downtimes on my PHP-based sites because of changes like PHP-FPM. Some sites just dropped working for me while others kept doing OK. This is in the same server, with the same database and the same codebase (WordPress).
After a lot of time programming on Node.js and been learning more Ruby (CoffeeScript made me love the syntax) I just got tired of using more resources of what I really needed, and with a regular CMS that means a database. Why would I need a database if I just update like once a day? For a comment-system? There's Disqus already, and people can just comment you on Twitter or make a Branch for it, or just write you an email! Plain simple.
So there was Jekyll, a pretty nice tool creating static-sites very fast and easy to learn. It didn't needed a database and because all is static is pretty fast. Even the hosting requirements got lowered to the point I could (and I did) just upload this to GitHub and served it from there as a GitHub Page!
One more thing
One thing made me decided to upload to GitHub as well was Prose.io, a simple text-editor for GitHub with support for MarkDown made by the guys @ developmentseed.com. So while it was made for being updated on my terminal I could just do it as well from the web, from anywhere with just my GitHub account and having previews on-the-fly.
Since I don't control this server I couldn't setup redirections for my old feeds. Of course, I could have just copied the same pattern in a folder and put there an XML feeding the category X, but I think is easier to update the planets being feeded to the new URIs.
On the bright-side
I even could put pretty-permalinks to work! So the structure for my old links kept the same.