Alan Tudyk (Wash, the pilot) from Firefly gave an inteview recently that explians why all those ship corridors are so wide on all those Traveller deck plans. While explaining the changes they made to Serenity (the ship) for the movie:
Tudyk added, with tongue in cheek, "The hallways are a little bit wider to accommodate better acting... You need wider halls for better acting. The first rule of acting: wide open space."
So, now we know. Wide corridors for better acting.
Link to whole article:
http://www.scifi.com/scifiwire/art-main.html?2004-07/09/13.00.film
via Fireflyfans.net
Tudyk added, with tongue in cheek, "The hallways are a little bit wider to accommodate better acting... You need wider halls for better acting. The first rule of acting: wide open space."
So, now we know. Wide corridors for better acting.

Link to whole article:
http://www.scifi.com/scifiwire/art-main.html?2004-07/09/13.00.film
via Fireflyfans.net