Outlining and sorting data
During the demo, Engelbart created a quick list and used an obscure formatting command and a lot of copying and pasting to create an outline with headings. With a modern graphical word processor, it's a lot easier: Select any list, pick an outline style, et voila! The barrier to creating an information hierarchy is gone.
Software developers have taken Engelbart's vision even further with tricks like one-click data sorting. A mainstay of spreadsheets, basic alphanumeric sorting is now everywhere: Click on a column heading of any list in almost any application, file manager or website, and you can change its sort order. It's so easy you can do it by accident.