I've been using a Mac for 20 years, and a mouse for even longer. Clicking is second nature to me. For the last 13 years, I've been using trackpads, on laptops and even as external devices. (Amusingly, a trip to the TidBITS archive revealed that I covered the release of the PowerBooks in which the trackpad debuted, back in "," 1994-05-23.) And for less than a year, I've been using the Apple Mighty Mouse with its secondary-click capability and clever scroll ball, and the MacBook trackpad with its two-finger secondary-click and scrolling features. I appreciate these features, but it would never have occurred to me that I couldn't live without them.
So imagine my surprise to discover myself hamstrung by the one-button, uni-click trackpad on the PowerBook G4 I've borrowed from work while my MacBook is off being repaired by Apple.
Even after three days using the loaner laptop, my fingers keep insistently trying to scroll, despite the PowerBook's stubborn refusal to recognize the two-fingered gesture. I did manage to slip back into the habit of using Control-tap instead of the two-fingered tap to bring up the contextual menu, though I miss that shortcut as well. (Similarly, I have apparently been spoiled by the Apple Mighty Mouse's right-click feature, and now find myself a bit lost on older, single-button devices.)
Thanks to Adam for pointing out the availability of Raging Menace Software's $15, a replacement trackpad driver for most iBook, PowerBook, MacBook, and MacBook Pro models. (The developer says an upcoming version will support MacBook and MacBook Pro models released after October 2006.) SideTrack looks terrific, offering a scrolling zone at the edges of the trackpad and even configurable secondary click features. For just a few days on an old laptop, I can't see trying to retrain myself, but if I were going to be using a laptop without the two-finger features for a while, I'd definitely give SideTrack a try.
The Mac's point-and-click user interface has changed so little over the last 30 years that it's hard to imagine growing so dependent on small enhancements, but as the graphical interface we're controlling with that mouse, trackball, or trackpad grows ever more complex, I'm finding myself taking advantage of - and becoming quite tied to - these capabilities.