I’m not sick of it yet, but it’s certainly true that IT is the only field where you have to learn approximately a bachelor’s degree worth of knowledge every 2-3 years. You’re always running as fast as you can to stand still. And usually not even managing that.
Note that I am not saying that other fields don’t require learning. They do. But nothing compared to IT, where new technologies are often introduced, become ubiquitous, and then enter obsolescence in five years.
It does wear on one after a while.