I love the shoulder shocker - I've had a rotator issue for years and dont like shoulder pressing movements.
One thing to note about growth and the shoulder shocker. As was mentioned - don't just go through the motions, make progress (rep or weight wise)
Secondly, if you do the shoulder shocker as your only direct shoulder work (like me), then you need to do your bench press using a powerlifting technique; and seated rows using strict form - these two elements are key (coupled with the shoulder shocker) for gaining size without using any other shoulder press movements. If you re-read that article you will get more info on that.
I recently dumped the front plate raisers, and now do seated side laterals, then bent over laterals, then the shrug/clean & press. It's harder than the original version, but I need the extra rear delt work. Loving it.
Anyway, stick with it, push hard, and see what results you get. My benching has progressed so much since I dropped the shoulder pressing movements.