Yes, movie resizing is a standard feature; it's not reliant on Core Image like the Dashboard ripple. AFAIK, Dashboard is the only part of Tiger that uses Core Image's real-time effects.
Don't worry, you're bound to get more sooner or later. It's only a matter of time until Apple updates iPhoto, iMovie, iDVD, and Final Cut to use Core Image/Core Video, and they'll scream on your machine.
Look for some very cool third-party screensavers and iTunes visualizers, too. They'll probably start trickling out any day now.