In the cases where I'm already an expert and I'm working in a legacy system and/or on a hard problem, it's small change. Where I have no knowledge, it's an incalculable change because it's enabling me to (quickly) do things I could not before.

For example, I do not know rust but I've been using AI to make https://git.sr.ht/~kerrick/ratatui_ruby at a really rapid pace.