I use, at varying times, the dots just past the foul line, the arrows, the dark marks way down the lane and various boards between the arrows and the dark marks; not to mention once in a great while the shadow of the pin. Depends on oil volume, pattern, carry down (or not). If you can learn to use all of these it will help your game. Generally the drier it gets out there, the further down I target - rarely do I target at the arrows, usually I'm looking further down.
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"A little sincerity is a dangerous thing, and a great deal of it is absolutely fatal." Oscar Wilde
Ragnar sure likes to throw his purdy Uranium Buzzsaw.