The shell is my development environment. I open up new terminals and shells willy nilly. I find cli tools like find/fd/grep/rg are useful because I rarely need to find only the definition of a function, but rather other call sites too, to find out how it is being used. I think being surrounded by the code and being able to slice and dice it leads to a certain kind of familiarity that a tool that takes you right there doesn't afford. I like fast compilers, and type checking, so it doesn't matter if I can remember the types and fields. I'm not bothered by error messages or warnings, I fix them and I have a greater understanding of the code I'm writing. My editor is a pretty stock vim setup with format-on-save and syntax highlighting, but I can operate without those (in fact, I'm often hindered by some other defaults, like bad color choice (dark blue on my black terminal) that makes things hard to read. I dont have much vim customization because I can not rely on it always being there. I use a pretty basic setup that lets me be productive in just about any default unix/Linux environment. I find IDEs to have a lot of visual distractions. When I was first exposed to unix in the early 90s, programming using it just clicked for me and I've never really felt hindered by the defaults. I read man pages and the languages' stdlib docs (usually web pages) so I'm a little more than passingly familiar with what's in them and their capabilities and how to navigate them.