IT can be a bit daunting when you first look at it. Loads of simple little effects that don't do anything really exciting on their own. The beauty of AE is the way it allows you to animate almost anything over time, and the way it lets you combine effects to create unlimitedly different results...
Sounds like you just need to precompose the layer with the Channel shift on it, perhaps?
Say you have a photo on one layer, and you want some transparent text to move across it, just blurring the background (see http://howiem.com/randombits/dammit.png for example), you'd do something like this...
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