My absolute favorite feature of WP back in the day was "reveal codes". (F7 IIRC). It was a Godsend for fixing formatting issues. It's one of the few features that I'd really love to see in OpenOffice.
WP for Windows still has Reveal Codes, but it’s more convoluted than with DOS.
In WP, a Table was powerful in that it was a basic spreadsheet and you could do calculations in it.
You could “block” (”select” in Word) a section of a document, and save that section as a new document.
In the DOS version, on the same line, you could do justify left, justify center, and justify right using keystrokes. When it went to Windows it lost that functionality. A far as I know, the only way to do that is to create a 3-column table and hide the gridlines.
Dot leaders made sense. Headers and footers were easier than with Windows version, and 1,000 times easier than with Word.
In Word Perfect they have a justification setting called “all”. It is like full justification, but it will make every line take up the full width between the margins. This is great if you want to spread 1 line across a page or cell.
I despise Word.