Sure no problem. One thing that I find really useful is the ease of access to launchpad with the trackpad. I find myself able to launch applications so much more quickly by just using the gesture to bring up my most used apps. It's quicker than having to through the finder, an app stack in the dock, or through spotlight. Think of LaunchPad as being exactly like the iPhone/iPad home screen. Sure you could map launchpad to a function key, but I find that to be very cumbersome.The gesture I find myself using the most right now is the four finger swipe left or right, which allows you to switch between your spaces. I almost never used spaces in leopard/snow leopard, but I find myself using spaces everyday now, because it is so intuitive to just swipe my hand and "pull" the next desktop over. From my understanding, the Magic Mouse only supports two finger gestures (full disclosure: I've never used a magic mouse, I had a Logitech MX Revolution before the trackpad and a bluetooth mighty mouse before that). Many of the gestures used in lion for launching expose, or spaces, etc. require three or four finger gestures, so when I was debating between the magic trackpad and the magic mouse, the trackpad was the no brainer.
As someone who is an avid photographer, I've found that manipulating images is amazingly easy with the trackpad, from zooming to rotating photos it's so much quicker than going and actually clicking a button or using a keyboard shortcut. While this doesn't specifically apply to you, I personally find it to be one of the biggest perks of the trackpad.
Finally, the fact that the trackpad is so large makes it extremely comfortable to use. It is probably twice the size of the trackpad on a macbook pro. So if you are at all worried about ergonomics, know that there should not be any issues with hand cramping due to having to scrunch your hand up to make gestures.
-Don