Middle-Mouse-Button = Rotate
[Ctrl] + Middle-Mouse-Button = Pan
[Shift] + Middle-Mouse-Button = Zoom
If mouse is over the Graphics Window: Scroll-Wheel = Zoom
If mouse is over the Feature Tree Window: Scroll-Wheel = Scroll the Tree
Note: The Feature Tree in SolidWorks is always in a separate Window (whether you're in a Drawing, Part, or Assembly file).
All that 2-finger mouse clicking and the click/tap required by Catia is very frustrating if you've ever ran SolidWorks. Personally, my shoulder hurt for days after switching to Catia (before I got a SpaceBall).