You really don't get the concept of a watch? You sure?
I used to lose my phone more whenever I went out drinking until I got the watch. That's because I used my phone to tell the time. So it was in-and-out of the pocket. Now, I keep my phone in my bag and I haven't lost one in two years.
You're just going to wind up making changes where you don't need them that way. There's no guarantee that because the code looks the same it does the same. An IDE can't figure out what side-effects will happen.
By just letting your IDE make changes globally, you're running the risk of introducing bugs. By DRYng up your code, you know that the change you make will have the same result everywhere.