This is something I don't like about the 6+, it has a loud Clacky sounding home button, yes I figured out if you press on the edge it is much quieter but you shouldn't have to compromise like that, it should be subtle with a full finger press. To me it really makes the device lose sophistication, you have an amazingly advanced piece of technology but the main home button feels and sounds like a fisher price toy.
The last iPhone I had which had a silent and subtle home button was the iPhone 4. Some people whined about how it felt too spongey and there may have been some issues with the need to replace it because some people are too harsh with their presses and damaged it. It was probably this that made apple redesign the home button as the 5 also has an annoyingly too loud clack sound.
The new iPad mini 4 has a much more subtle and pleasant home button, maybe the iPhone 7 will have a more subtle and sophisticated one also.
A way to avoid the loud clacking home button all together is to use assistive touch, which brings up an onscreen menu of many on screen buttons you can arrange, you can even turn the device off with a screen button, and if you have smaller hands this makes the 6+ really usuable without having to slide up from buttom or top to get control centre