Disk Usage Analyzer reports that the .ecryptfs file is taking up as much space as the home drive

This is a bug in the disk analyzer utility. It is misrepresenting the amount of storage that's actually being used on your disk.

The files that are actually written to disk (if you're using Ubuntu's Encrypted Home Directory) are located in /home/.ecryptfs. The files and directories you see in your $HOME are actually a virtual representation of your encrypted data. It's a phantom view of your decrypted data that the Linux kernel presents to the rest of the operating system. Rest assured that it's not taking up twice the disk space.

Full disclosure: I am the author of Ubuntu's Encrypted Home Directory feature and one of the current maintainers of eCryptfs.

If your home disk is encrypted analyses from root file system will be incorrect as it displays /home/.ecryptfs But if you choose /home/<user>/ It will display the correct information