Absolutely. If you ever need to have repairs done on a notebook or iPhone out of warranty, you'll find that the simplest repair will be more than the cost of AppleCare. No clumsy receipts or cards to deal with, just walk into any Apple store with the product in hand.
My only complaint is that when they need to order parts for older devices, it can take a while (up to two weeks), but that's a complaint about the universe, not about Apple.