AI has been good at auto-completing things for me, but it almost always suggests things I already knew without even web searching. If I try to get advice about things I know nothing about (code wise) it's a really bad teacher, skips steps, and makes suggestions that don't work at all.

I'm guessing there's been no software explosion because AI is really only good for the "last 20%" of effort and can't really breach 51% where it's doing the majority of the driving.

Apropos to use the term "driving" I feel. Autonomous vehicles have largely been successful because the goal is clear (i.e. "take me to the grocery store") and there's a finite number of paths to reach the goal (no off-roading allowed). In programming, even if the goal is crystal clear, there really are an infinite number of solutions. If the driver (i.e. developer) doesn't have a clear path and vision for the solution then AI will only add noise and throw you off track.