As Brian said above, the NEF size depends on the compression you use at the time of capture. Nearly all computers made in the last 5 years should not have any issues with handling a 80mb photo file but try importing 400+images into Lightroom or open multiple images in Photoshop and start adding layers and you'll soon find yourself in trouble with a lesser computer. The difference in Lightroom when using the laptop versus my gaming desktop is night and day and the laptop is only 2 years old and that is with my D700 compressed NEF's.
So if you're editing 1 or 2 files at a time, then there is no need to worry about computer specs but I'm guessing that a lot of users on the forum are either pros that shoot weddings and events or advanced hobbyists like myself who shoot 100+ photos at a time, then need to import them, view them and edit most of them. I use Lightroom, and a good computer makes all the difference in how fast the full size photo can be rendered and how quick the changes take effect when moving the editing sliders. I my gaming computer the photos are rendered immediately but on the laptop I have to wait for a few seconds and then I have to wait again if I move a editing slider like white balance or exposure, it's only like a second or two but it's still annoying.