I have never been a fan of the darker Adobe-wantabe interface grey. I really like the light grey of the older Vegas Studio. Much easier to read buttons and menus for those of us with poorer eye sight. Let the Pro editors have their dark interface. At least, give Vegas Studio users a choice or several choices.
Note that now in Vegas Pro 15 "Users can specify one of four options for the shading of the VEGAS Pro interface ranging from very bright to a dark interface. Users can define the amount (strength) of color they want shown in their buttons." So I'm expecting to see (some of) those choices "turned on" for the next upgrade of VMS.