I believe that AI+Coding is no different from this perspective. It usually takes senior engineers a few weeks just to start building an intuition of what is possible and what should be avoided. A few weeks more to adjust the mindset and properly integrate suitable tools into the workflow.
What is changing - constraints are relaxing, making things easier than they were before. E.g. where you needed a complex RAG to accomplish some task, now Gemini Pro 2.5 can just swallow 200k-500k of cacheable tokens in prompt and get the job done with a similar or better accuracy.