I work in the newspaper industry - first as a graphic designer/web dev, and now as systems manager. I grew up on OSS, and learned the Adobe suite later on.
I try to regularly check up on how OSS is doing regarding my industry, but sadly, it IS lacking. We require so much in the industry, even beyond the obvious stuff (excellent type support, CMYK support, etc). For instance, our RIPs (raster image processors, taking the digital art and burning it to film) require specifically prepared PDFs. We print to postscript files and run them using a specialized preset in Adobe's Distiller to make our PDFs.
As well, we also frequently have to work with artwork provided by clients using a variety of software; not just Adobe, but Publisher generated, and more. Also, we use a software/database combo that allows us to integrate storage of photos, articles, and page layouts, with a slew of features that streamline our work to an extreme (which uses MySQL, though).
There ARE some great open-source programs out there; I love RAW Studio for processing raw photo files. Gimp works fine for web graphics, but I hesitate to use it for print processing just because Photoshop gives us such a great level of quality control and color processing in the CMYK environment.