Two big monitors gives a TON of workspace. Having the ability to open multiple windows makes moving files around easier, allows you to have reference materiel and a search page open while working on a document (great for school work), etc.
If you do a lot of graphics, it is nice to be able to have multiple images open for cut/paste layering and such. And, being able to zoom in to where a pixel is readily visible with enough of the image showing to give context while editing is handy. Likewise, it’s nice to have room for the toolboxes and other editing panels (This is GIMP, editor layouts will vary)
Another big help is being able to stretch those video timelines out for faster editing without having to slide back and forth so much
