With recent releases, the differences between Movie Studio and Vegas Pro are so unremarkable that most professionals could use VMS for 90% of their work without feeling compromised..
The advantages of Vegas Pro, are mostly "specialty" capabilities, that a few pros will use a lot, and most will use occasionally.
Wedding shooters and eds I know are pros. I was wondering if any in the Tv industry, or larger operations used it. Sorry I wasn't clear in the original question. Fancy meeting you here Steve. See ya' at home base. :)