I disagree. If they want to encrypt their personal accounts that is fine. But as an employee the account is not theirs and privacy is not expected.
My department, in DoD, sets encryption on as default. It's a pain in the ass, so most turn it off from default. Encryption is available to everybody with a common access card.
The private encryption key for e-mail is escrowed by DoD, so it can be retrieved to decrypt the emails if necessary.
Our disk drives are also encrypted with a similar private key.