I am not a super hacker, but enjoy certain root apps and the freedom that comes from an unlocked bootloader.
I've used a Samsung Galaxy Nexus, Nexus 7, and Verizon Moto X (2013) Developer Edition as my primary devices at different times.
In my mind, the Moto X DE gave me a Nexus like experience (fast updates, stockish Android, easily rooted, unlocked bootloader).
The Turbo and Moto X 2014 are nice phones and, if they could be easily unlocked, I probably wouldn't have ordered the Nexus 6.
However, they can't. So, yes, the Nexus 6 is worth the premium for me.