Actually I find verification pretty lightweight, because I tend to decompose tasks intended for AI to a level where I already know the "shape" of the code in my head, as well as what the test cases should look like. So reviewing the generated code and tests for me is pretty quick because it's almost like reading a book I've already read before, and if something is wrong it jumps out quickly.

That said I have a different theory for why AI coding can be exhausting: the part where we translate concrete ideas into code, where the flow state usually occurs, is actually somewhat meditative and relaxing. But with that offloaded to AI, we're left mostly alternating between the cognitively intense idea-generation / problem-solving phases, and the quick dopamine hits of seeing things work: https://news.ycombinator.com/item?id=46938038