Although given the descriptions of functions and types I actually think sensors are rarer than is supposed, definitely rarer than is supposed on this forum presently, I know that I dont pay attention to fine details, if I take a walk and come back and take a note book to list the things I've seen and thought about unless I've done it deliberately I wont be able to recall the fine details, its not second nature to do so.
Training and the roles people play, such a work, can influence this, like if you're used to making records of a precise and concise nature or if you are used to contact with people who require those sorts of things in communication then it can give the impression of sensing rather than the thing itself. There is also the fact that descriptiveness or artistry in sentence construction is confused with sensing, when really its descriptiveness and artistry in sentence construction, that's it. Otherwise every successful (or at least popular) novelist is a big sensor and not simply calling upon imaginative prowess.
I actually think that the text based nature of most online communication appeals to Ns more than other types. I know that's cliched and likely to be prone to reductive interpretations, like all Extroverts are offline having parties and social gatherings and any Extrovert online is not a true Extrovert but I think there's an element of truth about Ns online. Before the internet I think they would have been involved in correspondence or writing of some kind.