My experience is similar, but I feel I'm actually thinking way harder than I ever was before LLMs.

Before LLMs once I was done with the design choices as you mention them - risks, constraints, technical debt, alternatives, possibilities, ... I cooked up a plan, and with that plan, I could write the code without having to think hard. Actually writing code was relaxing for me, and I feel like I need some relax between hard thinking sessions.

Nowadays we leave the code writing to LLMs because they do it way faster than a human could, but then have to think hard to check if the code LLM wrote satisfies the requirements.

Also reviewing junior developers' PRs became harder with them using LLMs. Juniors powered by AI are more ambitious and more careless. AI often suggests complicated code the juniors themselves don't understand and they just see that it works and commit it. Sometimes it suggests new library dependencies juniors wouldn't think of themselves, and of course it's the senior's role to decide whether the dependency is warranted and worthy of being included. Average PR length also increased. And juniors are working way faster with AI so we spend more time doing PR reviews.

I feel like my whole work somehow from both sides collapsed to reviewing code = from one side the code that my AI writes, from the other side the code that juniors' AI wrote, the amount of which has increased. And even though I like reviewing code, it feels like the hardest part of my profession and I liked it more when it was balanced with tasks which required less thinking...