Ive done it this year. The I Quit Sugar Facebook was/still is very useful, but you don't need to pay or do the 8week thing, just use the tips and do it yourself.
I was like you, I ate pretty healthily but then ate a lot of chocolate and biscuits. I decided that I had to tackle my addiction in January. Since mid January I've lost 22lbs and inches from everywhere, but particularly my waist, legs and face. I've got at least the same again to lose, but it feels easy and like I actually can (I've yoyo'd on weightwatchers and slimming world for years, always struggling with sweet stuff).
I haven cut out sugar completely, I still eat a good amount of carbs, I eat loads and loads of fruit, I still eat large portions, I haven't particularly done any more exercise. All I've done is cut out processed food and refined sugar as much as possible. I've still had nights out, drunk alcohol, had mini breaks, I've just not gone mad. Oh and I've dropped all diet versions of things - so gone back to full fat yoghurt and butter, and ditched skinny lattes for regular ones etc.
I'd highly recommend doing this "diet". It doesn't feel like one and if I can do it anyone can, I was a major chocoholic.