a point in IDEs' favor is the actual tokenization and static analysis they do. no matter how fancy the plugins for your text editor get, an IDE is built around the idea that the machine should know how to link your code together. it's not just making a best guess that if two tokens look similar in the source code they must be related, an IDE knows that given the rules of the language that you're writing in, that those tokens are actually equivalent.
you can move through source code (and library/vendor code) much more quickly and accurately when you're not just doing a glorified find-all.
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