I own several expensive Mac Pro silver towers. they do not have Applecare.
All of our Apple notebook computers have had Applecare. I would never dream of owning a portable computer without an Applecare plan. It runs on batteries, and you can subject ito to tremendous G-forces just in moving it about in daily use.
In addition to the obvious written benefits, I have personally found that if you encounter any sort of gray area involving discretion of the Apple store employees or store manager, these situations tend to break your way when you have paid for Applecare AND your Mac does not seem "beat up".
I think this is because you are seen to have done "everything possible" to take care of your computer. It seems Apple will be slightly more likely to take care of you.