Acting without doing SOUNDS good, but... (Ask MetaFilter)

I really liked this AskMe question about Quicksilver, since it's one that comes up a lot for folks who don't get as enthused about the app as I (and many of you) do:

Everywhere I go on the internet, Mac users rave about Quicksilver. I've downloaded it a couple times, and I sort of get that it COULD be really useful, but I am not sure how...

So what am I missing with Quicksilver? I see so many other people who get a lot of use out of it, and I am sure I can fit it in somewhere, too, but I just can't seem to figure it out....

Here's a portion of how I responded in comments:

Quicksilver provides access to almost any kind of stuff in your Mac's and your world -- contact information, bookmarks, files, Applications, system settings, and pretty much anything else -- and it lets you leap to any of these things by typing a few letters of the name (NB: Spotlight is more about contents and QS is more about names; they're complementary, not competing). So, that's the neato, Day 0 stuff.

But the big sexy comes with how QS understands the potential verbal relationships between any of those objects, then gives you a single keyboard interface for making amazing things happen...

I'll admit that it always makes me realize what a fanboy I am whenever I try to explain Quicksilver, but, truthfully, it is kind of challenging.