how do you use Safari on your Mac?
I've always mainly used Mac laptops, and I have to say that I never found that using a Magic TrackPad felt natural. I tried it when I still used a MacBook with the older TrackPad. The experience is very different when the TrackPad is built in and has a well-defined location relative to the other keys, so you may have a different opinion of TrackPad usage if you ever get a MacBook Air. I've often wondered how many Desktop Mac VoiceOver users feel comfortable using the Magic TrackPad.
I'm very comfortable with keyboard shortcut navigation, and usually give directions this way when answering questions on the mailing lists, because these generally work even for users of older operating systems - unless a question is specifically about TrackPad gestures. That said, there are some TrackPad gestures that are ver efficient, like the ones for interacting, moving to the menu bar or the dock, and the gestures that are similar to iOS for toggling the screen curtain or muting. I do use the QuickNav single letter navigation a lot (although maybe that's still keyboard based). I suspect that a lot of users who came to the Mac relatively recently from the iPhone may appreciate navigating with gestures on the TrackPad much more than we do.