You’ll rarely do more page scrolling than you do in a web browser. Scrolling is a constant activity.
Fortunately, Apple gives you about 11,339 different ways to do it.
You can use the regular scroll gesture (two fingers on the trackpad). You can also press your and keys to scroll one line at a time. Page Up and Page Down scroll in full-screen increments, while Home and End whisk you to the top or bottom of the current web page. And if your mouse has a scroll wheel, it works, too. (Hold Shift while you’re rolling the wheel to scroll horizontally.)
But maybe the best way of all is to tap the space bar each time you want to see more. Press Shift-space to scroll up. (The space bar serves its traditional space-making function only when the insertion point is blinking in a text box or the address bar.)