I don’t mean multiple panes where several files can be viewed together.
I have a single file that spans a few hundred lines, where each line is approximately 80 characters. On a high resolution screen, the text takes up the left third of the screen while the right 2/3 are blank!
Rather than scrolling vertically, why not scroll horizontally and layout the code in multiple columns?
On my 13in retina, I can see maximum of around 64 lines. There is plenty of room for two more columns, which would result in around 192 lines on screen, at the same time!