I feel the opposite, AI is making me less tired at the end of a working day even though I get much more done.
What used to tire me: being forced to have a sharp eye for syntax errors when programming, or simply the effort of all the typing and navigating through source files. Trying to visualize details of the codebase I was changing, while at the same time keeping a high level picture in my head of the feature I was changing.
With AI, I can focus on the high level picture. I can focus on the steps to get there and the steps to verify that it works. I don't have to focus on syntax anymore and there is much less need to visualize large parts of my code base. With AI, work is still tiring but much less, and in a different way.
Sorry but is this a bot comment? (Not replying, asking other readers)
You were probably just inexperienced in coding. AI has completely bridged that gap. Someone with a 1000 hours coding experience has almost the same speed as someone with 10 hours of experience who gets stuck on syntax like you said.
In return, there is not much of mastery anymore. Being a craftsman is a deeply human desire that AI is destroying, not sure if this is a fun future to look forward to.