What I like about a computer spreadsheet is that it's easy to sort the list according to a particular number, then make a print-out. I can have one list for Strength, another for Psyche, etc, and if I add an NPC I don't have to re-write the whole thing but can instead just insert, sort, and print again.
Like all handy tools, it has to fit a person's individual style. Some people rely on a GM screen when they run an RPG, others prefer to have a book handy, still others use both. Doesn't make the GM screen any less handy for those who like them.