Everything used to be a lot more time consuming and cumbersome.
As an example you had to go down to the sound library and search through reels of sound fx (later CDs) armed with a notebook looking for one sound effect. You usually picked the first one you found, took it back to your room, and sampled it in to the computer and synchronized it to the picture and went to the next effect and the repeated the cycle. since you could only do very short sequences because of lack of computer memory, you laid back to tape and hand wrote (legibly) each event on a cue sheet for the mixer.
Now you audition sounds from your database of hundreds of thousands of sound effects available to you remotely and pick just the right sound, and if you want to alter the sound, you have at your disposal a dizzying amount of plug-ins to change every aspect of your sound to fit the picture. You then upload it for the mixer to open in his session. (no more carrying reels and reels to the stage)