I just started using Hakyll and it's really awesome. It's very configurable, and integrating with Pandoc makes it very versatile.

Maybe this doesn't matter to most people, but having Pandoc means support for math (e.g. TeX) is standard.

I have a fairly complicated setup at the moment, and yet it still has less than 100 lines of configuration.

Also, being in Haskell, I've found it pretty fast so far despite being written in and configured with a very high-level language.

I'm short, Hakyll is awesome. Much better than my old solution which was a bunch of hacked-together php. (I was using my school's shared Apache server, a don't judge me :P.)