I used to wonder this myself. But then I realized what my own work probably looks like from the outside. It's seemingly basic and easy to describe. But in reallity... not so much.
3-4 hours per day is mailing people back and forth. A single decision must go through a lot of people. There's a problem with an earlier decision and the same people must be informed and a new one must be made. Do what I'm supposed to do but something is broken or missing. The phone keeps ringing. Rinse and repeat.
Some days are pretty relaxed, but most days are juggling projects, people, time and money. I think it's something like that for a GB editor.