Use Cases and Deployment Scope
I use WordPerfect Office for pretty much all internal documents and for documents that will be converted to PDF for clients. I particularly prefer WordPerfect for large documents (e.g., 50 pages). It has great capabilities for dealing with references and footnotes. I also like the fact that I can use the "Reveal Codes" option to see what tags are in the document and to edit them if need be. I also use Quattro Pro. It is not as powerful as Excel but often simpler to use. About the only time I don't use WordPerfect (or Excel) is if I need to send the raw (i.e., not PDF) document to someone outside of the organization. Such documents usually go in Word format. Although WordPerfect has the capability to save documents in Word format the translation is often not perfect and formatting is affected.
Other Software Used
Kofax Power PDF, CorelDRAW Graphics Suite, Camtasia