I like to use a monospaced typeface for my writing. There are a few reasons for this. One is that it is useful for composing songs and poetry, as it allows one to line up breaks between feet or bars, and thereby keep track of the meter. I also like to print out songs for performance with those breaks. It makes it easier to stay with the rhythm, sing the right word in the right place.
For prose, a monospaced font helps the eye see mistakes. Yes, it is slower reading with monospaced type but that’s a good thing in this instance. The drafts of my recent novels (and poems) have first been typed out in Century Schoolbook Mono, 12 or 13 point. I liked the font for this purpose though I am sure plenty of others would work. Were I a writer of code — another application where monospaced fonts are useful — it would most certainly not be the choice.
I have long saved and printed song sheets in Courier New. This was simply because everyone had that typeface and everything would show up properly if I shared files. But it is not at all nice for reading from, for practice or performance. I tried alternatives and finally settled on Courier Prime, an ‘improved’ version of the typeface. It was no trouble switching my default style to it in Open Office, where I do most of my writing. It is set as my default font for text files too, which I write and read in Notepad++ these days.
Does any of this make much difference? Of course not. It’s just nice to have things working at their best. I like efficiency. I’ll probably go right on writing my books in Century Schoolbook Mono. It has more of a traditional text serif look than pretty much any other monospaced typeface, and that’s a good thing — at least for me.