Similarly in DCSS the levels are so large and there's so much space between interesting bits, that you spend a fair amount of your time mindlessly pressing keys to stride through the hallways.
Mind you, DCSS is much better about this than Nethack because there are things like waypoints and fast travel, loot/stash search (with ^F), etc. I'm not contesting that it's better than Nethack in this respect.
But if I may say, Brogue is better about this in that there are very few 'wasted' turns: the food clock is very finely tuned so you really can't waste too much time or you'll die, levels are very compact so there's not as much exploring to do (but there's just as much tactical depth on each level, if not more, because of how the environment works in Brogue).