A nuisance lately has been IDEA prompting me for my SSH key password every time I Commit and Push. Since forever, Ubuntu has added my key to ssh-agent every time I login, giving me both good security and password-less pushing from the command line.
I finally found the config tweak to push from IntelliJ without the prompt.
SSH Executable: Native
By using the native SSH client, you take advantage of native key management, like ssh-agent.