I'm not sure if Vim makes me more productive compared to other editors/ide's like Eclipse for example.
But somehow I get an empowering feeling when using Vim and noticed resistance to trying others editors.
Example: As soon a I see some cool feature in an other editor I'm thinking "Vi can do that (i just have to find the keystroke or configure a plugin)"
How can I benchmark editor productivity objectively?
My ideal editor would be: Netbeans feature set and ease of use, but with SublimeText's performance and slick looks.
Update
Visual Studio Code is now my primary code editor.
Sublime Text for config files and quick edits.
Vim for ssh sessions or editing with macros.
I'd say those symptoms are subjective clues that you're probably more productive in Vim - frustration with other tools is likely to be a fairly good indicator.
I would say with a huge degree of certainty that if you're into Vim deep enough to get frustrated with other editors, any productivity gain from switching is likely to be very small.