It's not so much the parts where think hard and implement that perfect feature. It's insanely useful when you have to make sweeping pesky changes.
Like a pulling values from a config dict and initializing a bunch of methods from the class? Or setting up a testcase similar to the one you already have, but with different values? Or cleaning values from a form? It's not a bulk edit. But it's also not thoughtful code-writing. It's monotonous and mundane. And lots of people do a lot of this on a daily basis.
Copilot makes this a cinch.