For those of us that started with a few boxes of punched cards and a tablet of 80-column coding forms
I am among those. IBM 360, I don't remember the model number of the punch card machine but, I do remember that the most used key was probably the "dup" key.... <chuckle> Of course, the program was handed over to an operator, direct access to the mainframe was usually out of the question. How times have changed.
with punch cards the only way to see more than one line of code at a time was to get a listing from the computer. These days, depending on the monitor one is using, it is possible to see over a 100 lines. That really makes a few lines of whitespace be a secondary concern particularly if their presence makes the code easier to read/understand.