Just thinking back to when I was first learning to edit video. A simple 3 minute video could take a couple of days (especially if the footage was spread over a number of tapes). I remember spending a whole weekend working on editing a simple video for the youth group I was a part of.
Today, by comparison, I was able to edit a 3:30 video in about 40 minutes. In HD no less. With titles. And transitions. And .. well .. you get the picture. We've definitely come a long way from a tape-to-tape editing system.