From a low time owner and pilot perspective, I think the 100 hour inspections are worth doing. Even though the problems are typically minor, we always find a few here and there. And when your A&P has infinitely more experience at recognizing broken stuff than you do, hell, it's worth having them just sit in your running helicopter every once in a while. They can more easily recognize sounds and vibrations that you might not. For example: that can be the difference between your fan needing balancing and a bunch of cracked engine air shrouds.