When shooting tethered, yes the large screen is one of the bonuses but there are much more advantages to going this route. Images are already imported into an external hard drive saving time. Including a file name to all the imports along with EXIF data. Choosing and customizing a preset so that while shooting, all the RAW images are adjusted for exposure, clarity, sharpness, saturation, WB, lens correction etc... All this is done as you shoot so at the end of the shoot all or most of the post processing is already finished.
I use Lightroom 4 to accomplish this and it works flawlessly.