Area lights are great for creating certain types of lighting but you do need to change the settings in Vue to get a good render with them.  They are not a good way of creating a fill light at the moment except in small scale scenes.  For a vast landscape I'd go with Chipp's suggestion of an infinite light with its power controlled by changing its colour. 

If you were working on a close up the old tricks for simulating area lights with arrays of point or spot lights work well and allow you to control the brightness.  The added bonus of that method is the render times are significantly less than an area light.  Personally I'd only ever use them when the light is visible in a render, is very close to an object that is in the render or will be reflected by an object in a render - the rest of the time an array of lights is far more efficient.

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