It's still fairly and broadly deployed, at least here in the UK. When I came to my new company (with my Powerbook), I was pleasantly surprised to find that all the printers in the office were Postscript and PCL.
I think as people become even more sophisticated with the use of color and graphics, it'll be even more widespread. Plus, Adobe isn't as dependent on the money from licensing Postscript, so the cost of adding it isn't really creating the spreads it used to.
I love me some PostScript. It's such an elegant and flexible language.
Timothy