I regularly use Markdown for making slides (via pandoc). It's great for throwing something together quickly. Obviously it's a lot less good if you want complex

I regularly use Markdown for making slides (via pandoc). It's great for throwing something together quickly. Obviously it's a lot less good if you want complex layouts, multiple columns, and that sort of thing. But I generally try to keep my slide layouts simple, and for more complex things I just use multiple slides, so it works for me.