I use PlainText and drop it into a separate folder in Dropbox to copy into my regular files. It’s not elegant, but it works. I’m afraid to edit my live files directly and especially when working in Beta, where people are accessing it. It gives me a layer of security, since I don’t have to worry about losing everything, just my current session. I had some troubles a while back with which instance was live and I’ve been hesitant and untrusting with it ever since.
It’s great if I want to do some writing, but it’s still not as good as Notepad++ on my regular computer.
I saw that Pages got a Tab button onscreen, but haven’t tried it yet. My Bluetooth keyboard with PlainText works well enough, so I haven’t looked very hard.