Will i benefit from important features of Lion with a trackpad/MacBook?
These answers are going to vary from person to person. Additionally, I have a Magic Mouse, which only supports a subset of the total gestures.

I think the the "Natural" scrolling really make sense on a touch-sensitive controller like the Magic Mouse or the Trackpad.

The two gestures that I've found most useful are:


Move backwards and forwards in Safari. I know this technically existed before Lion, but as I've previously said, the feedback of the animation makes it far more useful.
Two-finger swiping between spaces is wonderfully fluid.


On the contrary the two-finger double tap for Mission Control has been used a handful of times. I'm finding the ctrl + up far more useful, plus ctrl + down gets you to Exposé.

I think there are plenty of things to like about Lion without any gesture support. I can certainly recommend the Magic Mouse, something I would've hesitated to do before Lion.