If you knock the chunks off prior to loading, I don't know the need for a macerator. I *think* our current washer has one, but I don't really know. I do know the screen into the drain area has very small openings and the only things I ever pick out of there are the pieces of silverware I drop through the lower rack once in a while.
It really seems to depend on how you were brought up. For me, we did it by hand, so using a d/w for the first time meant scraping and rinsing to the point there really was no point. By then you might as well have just dried everything and put it away. It took a long time to get used to it, but now I just scrape things clean and pass them quickly under the water before I load them. Since we only run ours a couple times a week, stuff can really get dried on tightly if it doesn't get at least a quick rinse to give the d/w a fighting chance.