I visited the Windows Store in Windows 8 Consumer Preview but it’s difficult to navigate.

Is there a better way to navigate the store?

Do you mean you wanna search all apps? Press windows key + Q, and you can see all apps. Also, type the name of app in the box of right top if you wanna search one app.

The "Picks for you" and "Top Free" selections, are the only way I have found to get through the icons. Other than that, I have not found a way.
Threeone. No. I don't believe that is what the OP is looking for.

you can scroll threw the apps by using the mouse scroll wheel up and down that will scroll left to right on the page. You also have the option of going to the windows website and getting apps there.