There might be small areas of a home computer worth encrypting, but I don't bother. I've seen so many cases of people losing all of their data by failed encryption. And once someone compromises your computer it usually means they've got your password - encryptions no use then. But each to their own.
Most times it's not failed encryption, it's people forgetting their passwords or their drive fails and they want to know how to get the encrypted data off of it.
1. Always keep your password in a safe place (not on the computer with the encrypted drive).
2. backups can save you from a ton of potential problems.
Anyhow, it has it's uses. I don't encrypt my home drives. Our work drives (mostly laptops) I'll encrypt. It's essential.