I still write most of my first drafts longhand, but I'm slowly switching over to the computer because of meeting Arthur Itis, who convinced me it's a good idea.
I have a minimalist word processor that I write most of my short items on. I did use Q10, but it refuses to play nice with the latest version of Word, which is a shame because I love Q!. I'm not trying out JDarkRoom, and I think it's going to work out.
But for anything long, and for all final drafts, I use Word. It's as good as it gets, it's what almost all agents and editors use, and your life will be easier if yu have it.
I don't think you'll find a program worth having that doesn't have a learning curve, or that you won't have to research to some extent. But Word itself is easy to use, easily accessible, and should be no problem. You don't need every bell and whistle Word has, you just need the basic writing tools, and these are readily accessible.
If you just want a minimalist word processor for first drafts, try one of these.
https://gigaom.com/2007/06/22/10-free-minimalist-word-processors/
If you want to turn Word into a similar minimalist word processor/text editor, read this:
http://www.makeuseof.com/tag/how-to-turn-ms-word-2007-into-a-minimalist-text-editor/
Writers are quirky, and most I know try many programs, and then usually come back to Word, or now and then to Wordperfect, or LibreOffice.