At our studio we use Eclipse and you can add build preferences when saving a file. We built our own bash/shell scrips and just set them to run every time we save which compiles and minifies our script on the spot.
You could easily create a script that ran "node myfile.js" every time you saved.
I agree with needing more data but I will give my testimonial. I switched from Windows 7 to Mac Lion several months go and have not looked back. Simple things like responsiveness of the touch pad, gestures, and a better terminal are definitely what got me. Overall I would say the UX is just simply better.