alt Hacker Newsthrowing in my 2 cents: It just replaced pandas for me. It's just so much easier to write sql against csv/json/whatever format data in jupyter/marimo notebooks through duckdb rather than reasoning through pandas. SQL is far more natural for me, and agents also work through it easily.
really learning SQL (syntax, boolean logic, how queries are broken down, etc) way back in uni has been the single biggest pay-off of my entire career.