the big picture

It helps to revise at a canter.  Because the big question on revision is the big picture.  Not whether this scene is dramatic or effective enough, but whether it contributes to the setting, the characterization, the plot, or the theme -- and preferably several.

Which means you need to hold it all in mind and revising at a canter helps with that. Especially since you need to read what you wrote and not what you thought you wrote. A scene that would be useful if only it was what you imagined. . . .

This can be awkward if you can't apply yourself steadily to it.