During most of my career I've worked without an IDE, only using a text editor and some CLI tools. At my previous job the CTO smiled when I mentioned this during the interview, saying he liked that without telling me why.
Now I understand: it forced me to design things so they are simple enough to fit into my head.
The codebase I'm working on right now has been written by people who love both IDEs and OOP design patterns. It's a painful convoluted mess.
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