5-50x huh? Years of AI hype and yet still to this day, not a single person or organization can provide any kind of reputable evidence that it has significantly increased their productivity.
IME having a "rubber duck" for debugging & planning can be helpful. Having it talk back is a significant boost. Having it write the code isn't. AI is nice at helping me explain the problem I'm trying to solve to myself. It's much harder to write clear, unambiguous, succinct English than any programming language, but being forced to do so to explain something to an AI helps clarify my own thoughts. The AI's output isn't nearly as relevant, though it can be helpful since it can run its own searches across the code & invalidate my assumptions sometimes.