1. nano is the default text editor in Ubuntu's command line, except for man pages.. which you shouldn't be editing.
2. once one masters vi/vim you can do your text editing a lot faster than you can in nano or a gui editor. It's far more powerful. Just wait until you have to search and replace globally.
3. It's not that hard, i figured it out in one week's worth of usage. Look at vimtutor, it'll help.
These tutorials may help: http://ubuntuadministrator.com/?tag=vi as well
4. As to why vi is installed, is well, it's on every single linux system known to man. vi is small enough to fit on a boot disk and is great for recovery purposes back in the day of floppies. When you work with a large network of unix machines over ssh shells, you can count on the same text editor being on every single system, and that's vi or vim. That's not the case with nano, pico, or others.
5. The man pages aren't full vi/vim. You can drop into vim from them, I think, just as you can with less/more. But i don't get what's so complicated about man pages. Press 'q' to quit and use your arrows to scroll.
6. If one was to consider themselves just a run of the mill desktop user, why aren't you using something like gedit, leafpad, mousepad,?
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