I like "power." It's evocative, and it maps to the feeling you get with a good language - when your intent is made manifest with little effort, you feel powerful (and _are_ powerful).
How about things like readability and ease of maintenance and modification? To those people making real products (and not just coding for a hobby), enabling collaboration is far more important than whether it lets the programmer feel clever and powerful.
(Hobby coding is cool and important too, but the aims are different.)
