Notion's just a tool, like a pen and a pad. If you decide to use it for nothing but busy work, that's an option I suppose. But I get a lot of real work done using Notion.
According to this description I believe you could also say writing tests or using git is just busy work. Nevertheless, a lot of people use tools like git and notepad (or notion) to organize their work.
That doesn't make any sense. Notion is literally just a powerful text editor. If the act of using Notion is busywork, then so is the act of using a typewriter, a pen, a whiteboard, any other text editor, etc.