I use TextEdit on my Mac more than either Pages or MS Word.
It's incredibly useful for when I just need to make a short list, or I want to type up something (with a LITTLE formatting at least -- something Notes doesn't provide). Especially since it opens up so much faster than Pages, even with an SSD -- important when you're trying to make a note of something really quickly, like if you're on the phone or something.
I suppose notes could probably fulfill that functionality for me, but I prefer to be able to save documents wherever I want, instead of being strongarmed by Apple into throwing them all into an indiscriminant pile. Also, notes always used to be so ugly -- the yellow notepad paper was hard to work with.