I am bringing up this old thread to say that I also do lots of writing on an old standard manual typewriter. I have a collection of them and I use different ones depending on my mood. I write letters on them and also use them for journaling and keeping records, and for my mail and correspondence. I find that people really like getting something typewritten in the mail.
I think typing is fun, I like the sound and feel of it. The process is so different than writing on a computer. It is pure.
I also like tinkering with the machines in my collection, doing repairs or maintenance as needed. And I think the typewriters themselves are gorgeous.