Compile in -style PRETTY to see how GWT compiles your Java code down to JS. There won't be getX/getY (they'll be inlined), at least in the x,y case (and if there are, they'll be "staticified": getX(point) instead of point.getX()). And you'll probably see type coercion/checking in the array case (and if that's the case, as I suspect, it's what causes the difference in performance between your two implementations).
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