As a result we started using the Joby UltraFit Sling Strap (see the demo video below - No Sound) a few years ago and wow, it really does make a huge difference. The camera now goes over the shoulder and hangs securely to the side of your body. It has a small locking clip that will allow you to depress which will keep the camera tight against your body instead of swinging around. When wanting to take a shot just lift the locking clip and the camera seamlessly slides up to eye level and your ready to go.
There are quite a few brands on the market however we have found the Joby brand to be quite cheap yet well made. The more expensive brands seem to have more padding around the shoulder areas which would possibly be a little more comfortable however we're sure you could probably modify the Joby strap should this be required. There's also offers a model for Males & Females. We strongly recommend this product as it will take the strain off your neck over long periods of time and certainly save you a visit to the Physio or Chiro with neck problems.