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I have a nickel phosphate bolt group that began life as a parkerized unit which I sent out to be plated. Not only does it clean up more easily, but the metal surfaces are slippery even without oil. Natural lubricity. The first time I fired the rifle with that BCG, I ran 150-200 rounds through it on a 100° day. There was a fair amount of filth in the action, but virtually all of it wiped off spic and span with a dry rag. There was some carbon caked on to the tail end of the bolt, and that scraped off quite easily with a bronze bolt scraper, leaving a mirror finish behind.

From what I understand, nickel phosphate is even slicker than nickel boron, but even nickel boron has to be a whole lot easier to clean than plain parkerizing. My bolt was done by a guy AndyC knows who owns a NiPh plating business to the oil drilling industry. Apparently, the demands of that industry are very stringent, and the working environment is hostile. The finish on mine feels like a slick, glassy ceramic. Even when dry, it feels like it has been oiled. I still lightly lube the parts with FireClean.

But primary reason for playing isn't cleanup, but increased lubricity.