Some websites (IIRC twitter does) open link differently based on the referrer header, so automatically sending a twitter referref for all twitter links improves your experience.
Sending a Referer header does not improve [your] experience. It is the opposite for me. I cannot tolerate Twitter's Javascript, I do not use a graphical browser. I find it annoying when people submit Twitter status messages to HN.
I have a script that reformats the JSON into a simple HTML page with no Javascript. This improves the experience for me:
There might be more critical uses