Common Table Expressions (CTEs) in SQL are indispensable for experienced programmers seeking to write more readable and maintainable code. By allowing you to define temporary result sets that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement, CTEs simplify complex queries, particularly when dealing with multi-step transformations or recursive operations. They provide a clear separation of logic, enabling you to break down intricate queries into manageable sections, which not only enhances the clarity of your SQL scripts but also facilitates easier debugging and optimization. Moreover, when employing CTEs, you avoid the cumbersome nature of nested subqueries, making your intent explicit and your queries cleaner.

Performance-wise, CTEs can also contribute positively, especially in scenarios requiring recursive data retrieval or when working with self-referencing tables. They allow for better organization of code, making it easier to apply indexing and performance tuning strategies. Although they may not always outperform conventional subqueries or derived tables, the clarity and modularity they offer often outweigh minor performance considerations in complex scenarios. In essence, leveraging CTEs is not just about functionality; it’s about adopting best practices that promote a maintainable, scalable, and understandable database codebase.