Mouselook (Z toggle) and WASD, occasionally I use scroll wheel for quick movements. I don't like having to move my right hand from mouse to the arrow keys.
I use Z to get me in free look mode and then a combination of WASD and the mouse w/ scroll. Why anybody would use arrow keys instead of your mouse is beyond lunacy in my book. So much easier to point your camera with mouse and then use WASD for your maneuvering. I mainly use scroll wheel in top view to zoom in for vertex work.
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