I have been using paragraph styles in specific and many of the styles in the Styles and Formatting Window. So much so that I dock this window at the left side of Writer. This goes back to OOo 1.02 as I was writing the Getting Started with Base Chapter in the Getting Started Guide. I extensively use list styles along with the associated paragraph styles. I have even modified the list styles to make them do what I want.
Recently, I have been using Calibre to convert my writings to the ePUB format. The latter uses a style sheet for its formatting. Because the conversion from ODF to ePUB is not perfect, my experiences with styles permits me to make the changes I need in the ePUB style sheet.
I also agree with a previous poster: templates are very important when using styles. I have 16 templates many of which that I have created and use. Each one contains its own set of styles (paragraph, character, lists, and page). A couple of them are for resumes that are suppose to be quite professional. I seem to remember a law firm had created its own template for their legal briefs to make sure its structure was exactly what was expected.
Obviously, templates can take time to create. But once created, they can be real time savers. The only way I know to teach the importance of templates and styles is to have the students create a template with a complex layout using styles. Then have them create two papers with this layout without the use of styles. Then have them make two papers with this layout using the template. Let them determine which takes the least amount of time. Finally have them make a change in one of these papers by changing a style and then by changing things manually. See if they can even make all of the changes manually.
Just some thoughts.
--Dan