This would definitely make it Less Cluttered to Edit in Vegas w/ 'Folder Tracks'.
It would surely help me stay organized if I could group my 3D or Track Motion/Shadow/Glow/Text/Special FX/Audio Tracks/V.O./etc on their own tracks and into folders and collapse them.
I remember this being asked for in Vegas as soon as it was introduced in Acid.
I too would sure like to see it come over to Vegas. .