Does it have "smart" word wrapping like Sublime Text 2? I think it is one of the killer features for me. I sometimes need to work with a small screen and need word-wrapping on.
SciTE, with which Notepad++ shares the scintilla editing component, has quite a few settings for wrapping:
http://www.scintilla.org/SciTEDoc.html
(Search for “wrap” in the page.)
I haven’t looked into how many of those are supported in Notepad++, as I don’t use word wrap myself.