For a Vim user, this an alternative you would suggest to other people for editing files. ie, like its name suggests, if you can use standard notepad, you can use Notepad++, but you get more toys. I think its main advantage is it is fast, features are discoverable through UI, and out of the box it understands many kinds of filetypes and has a ton of features, macro recording, it has plugins with a plugin browser also. But as a Vim user, you don't really need it, though I do use it sometimes for random obscure things instead of Vim (like Mime encoding/decoding)
