Justin-
I will try to sum this up in the simplest way I can.
Top Notch Hollywood Studio's, eg.-Paramount, Disney, George Lucas Industries, ect. use a variety of software applications. here is a few of the companies w/ there editing software programs-
Apple-FCP HD, Motion, DVD Studio Pro, Shake(awesome!), and Logic.
http://www.apple.com/finalcutpro/ Adobe-Premier Pro, After Effects, audition, Encore DVD, and Photoshop.
http://www.adobe.com/ Discreet- Inferno,Flame,Flint,Combustion are awesome, along with 3ds Max and Mental Ray!
http://www4.discreet.com/products/ Eyeon-Digital Fusion(used in creating the movies- BLADE, BLADE TRINITY, The MUMMY, ect.
http://www.eyeonline.com/Web/EyeonWeb/default.aspx Pinnacle Systems-They have consumer products and Broadcast and Professional products.
http://www.pinnaclesys.com/ Sony-Vegas..
http://mediasoftware.sonypictures.com/products/default.asp One other big aspect of creating a pro video/movie is not only the awesome software but the camera, the computer, lighting. ect.. All of these is involved in creating high quality videos. This is why most of the people making these are actual production companies.