I used to use SQL very extensively, but then I moved into different roles, and now I always have to look up its syntax, stuff like "how did HAVING work again?", "how do I search for a date two days before today". With Text-to-SQL I can express my query in natural language. Because I have a very solid understanding of relational data models I can craft my prompt very precisely, but without constantly having to go back to the documentation. So at least for casual users it's very helpful.