linuxmemes

If you want to do document editing, then neither vim nor Kate are editors that do that. They are for editing text. You can write markdown, if you like, and then use pandoc or other tools to convert that to a printable document. I always use LaTeX if I need a pretty output, but that also has somewhat of a steep learning curve.

What you gain is the ability to manipulate text very efficiently. It's hard to describe, but it kind of feels like a lower overhead protocol of communicating to the computer what i want it to do to the text compared to "normal" editors. Again, if you only rarely write stuff, it might not be worth it, but it feels great

For just regular text to be consumed by humans, it's not that great, you probably want a word processor.

It shines when you do a lot of more structural editing, stuff like "change all quotation marks on this line to be single tick", "copy everything inside these parentheses and paste it after the equals sign", "make the first word on the next five lines uppercase", these are the type of things vim make easy that are not easy in other editors.

So it's great for code and config files. Markdown is borderline. You can have a setup that lets you live view how the markdown renders while editing in vim, so it can be pretty good, but the advantage might be a bit dubious.