This kind of automation takes the execution away from you, not the decision, and even that execution only concerns you. You wanted to shift into a higher gear, the car's computer does it for you. The result is what you wanted. A fully autonomous car that decides everything for you would be a better example.
If you let an AI grade an exam then a big part of what comes next is a decision that you didn't take or validate. You didn't remove yourself just from the execution, you removed yourself from the responsibility and cognitive effort to take the decision, and from the accountability for that decision.
If you can simplify and call every button press "just the computer doing things", then someone else can exaggerate and say a fully autonomous drone hunting humans is the same, business as usual, computers doing things.
theory: there are two groups that a lot of hackernews commenters fall into. And these two groups clash on every Ai post every day. One camp only uses Ai to write code and thinks of them strictly as LLMs with a clearly understood design and purpose but that show some surprising behavior, they've watched youtube videos that show how everything ties together computationally and mathematically, from neural nets to RL, etc. and dont see them as capital A, Ai. It's another tool in the toolbox, and thinking about them in the way you describe, as something closer to capital Ai would cause severe cognitive dissonance, akin to the idea that a hammer could hop out of the toolbox and start building a house. Even though what you've done is just take one small step of critical thinking, it would be a leap to the other camp members, who are themselves, quite technical thinkers.