I've seen a lot of these posts and my comment a few times has been that coding was difficult before, so when a challenge met your skill, this put you in the psychological state of "flow". When there is too much challenge and not enough skill, that creates stress. When there is too much skill and not enough challenge (what AI is now creating, by increasing your "skill") then you get boredom.

So you're "bored" now, and you need to increase the challenge to match the new "skill" AI has given you. So if before maybe you worked on a singular app that took a long time, now you might work on more apps (plural) that you complete quicker with AI.

Maybe an analogy exists with walking versus bicycle riding, although not entirely. You walked a mile somewhere and back and that felt like a good walk, but now with a bicycle 2 miles doesn't feel like much. You now need to bike the equivalent of that walk which might be like 5 miles each way to feel like you got a "real leisurely exercise" in. Riding a bike is also a different skill than walking, so you need to learn how to ride the bicycle.

It's totally valid to feel unhappy about the change, but I think if you find the right challenges you may go back to feeling the joy you had before.