DoubleClick is a valuable tool that helps users visualize the usage of disk space across storage, databases, tables, and table parts in ClickHouse. By crafting an SQL query within DoubleCloud, users can create a beautiful dashboard revealing disk space usage and free space for each element in their ClickHouse storage. The process involves creating a workbook, adding a connection to ClickHouse, selecting the appropriate chart widget type (Treemap), configuring dimensions, size, color, and customizing the appearance of the visualization. This enchanting combination of ClickHouse and DoubleCloud enables users to better understand and manage their storage, ultimately optimizing their data usage and ensuring the prosperity of their ClickHouse kingdom.