For me its the feeling of true understanding and discovery. Not just of how the computer works, but how whatever problem domain I'm making software for works. It's model building and simulation of the world. To the degree I can use the LLM to teach me to solve the problem better than I could before I like it, to the degree it takes over and obscures the understanding from me, I despise it. I don't love computers because of how fast I can create shareholder value, that's for sure.