Anything that's per-commit is part of the "build" in my opinion.

But if you're running a language server and have stuff like format-on-save enabled, it's going to use a lot more power as you're coding.

But like you said, text editing is a small part of the workflow, and looking up docs and browsing code should barely require any CPU, a phone can do it with fractions of a Watt, and a PC should be underclocking when the CPU is underused.