> Yes a JetBrains IDEs will take longer to build the AST model in RAM but once you have it they do amazing things with it. E.g semantic search and replace, etc. The debugger capabilities are spectacular, they literally show the values of variables on the side of the line you stepped over. Another cool thing, inferred types just show next to the variable definition, parameter names appear in the method call, etc. These are small things that add up to a lot on the day to day.

Emacs has all of the things mentioned, either through plugins (LSP, Tree sitter, DAP) or built in (tags, GUD). Especially LSP-mode has over the last few years made sure you can integrate your favorite text editor into pretty much any language, for certain languages/technologies it still makes sense to pull up the specialized tools for e.g. debugging, deploying, building, publishing etc, but you can do a lot with the more general tools too.