you obviously dont know quicksilver, you can make quicksilver do anything with a group of files that are composed of either the current selection or even multiple selections from multiple locations
If you want do this
PDF:
open in preview
open in Acrobat Pro
open in Photoshop
open in web browser
How long would it take in quicksilver? How long would it take to drag and drop?
BTW, I mostly launch apps using spotlight, been doing that for 3 years. Before spotlight I use Command A and type the app name.
I keep often used apps in the dock.
It's a Mac. You can customize your experience, easily. Just because you do things one way doesn't mean it's useless to do it another way that works better for other people.