As "Saint Zaanstad Cathedral" does not exist, there is no information on how busy it gets.
Since "Saint Zaanstad Cathedral" does not exist, there are no crowd levels to report. For real attractions in Zaanstad, particularly the Zaanse Schans, busyness levels fluctuate significantly. Peak season (summer months of June, July, August) and Dutch public holidays see very high visitor numbers, leading to crowded pathways, queues for attractions, and busy restaurants.
Weekends, especially Sunday afternoons, are also considerably busier than weekdays. To avoid the largest crowds, visit during the shoulder seasons (spring or early autumn), or go on weekday mornings, ideally right after opening hours. During off-peak seasons, the village experiences a much more tranquil atmosphere.