My reaction to your use of "fucking" wasn't that it appalled me in some moralistic or linguistic sense. Rather, I felt like it (partially) undermined the point of your post.
The post is about how being CEO isn't all glamor, and includes doing dirty work as well. And you make clear that you feel the janitor, unlike a figurehead who merely signs documents, contributes something useful and necessary to the enterprise.
Unfortunately, denigrating the janitor by tagging the role as "fucking" just buys into the CEO-as-glamorous-leader mindset that the post argues against. It transforms the title from a correction ("You think you are the CEO, but in reality you are in charge of the dirty work") into a put-down ("You think you are the CEO, but in reality you are the lowest of the low.")
Yes, it sounds stronger-- but, in my mind, it shades your meaning in ways you probably don't intend.