I'm a PM user as well. My workflow is Nikon based with View and Capture. I use PM for ingest, naming, preliminary captions and keywords, rating, detailed keywords, conversion to JPEG if needed, and watermarking everything as appropriate.
I also have used the watermark feature with wildcards to label images used in presentations with appropriate camera, lens, and exposure detail.
PM is very fast and flexible. Output tasks that would take an hour in View or Capture take just a few minutes in PM.
I do admit that PM is a bit hard to understand. It does so many things and the documentation is only fair. But there are some nice tutorials on the Camera Bits website, and a very good forum for questions.