There are a couple of things to bear in mind with this method:
1. Adding an actual text character (¶) to the end of every line or paragraph can -- and probably will -- cause the document to be reformatted at various places where the that character causes the line to wrap at the right margin.
As I said in my first post, using View>Show merely uses a symbol to display an on-screen representation of the end of individual lines and paragraphs, it does not add actual text characters at those locations. Think of it like the displayed page margin guidelines (View>Guidelines): they are not text characters and do not print.
2. Not only hard returns can "end" a line or paragraph. Paragraph styles (such as WordPerfect Headings) do the same thing. But since they are actually paired format codes it will be trickier to add a paragraph character symbol (¶) at those locations since the find-and-replace macro method used with (single code) hard returns won't work.