I use Dromona 'half fat butter' on my toast every day, but maybe that's not on sale outside NI.
I started using it when I began with SW and still managed to enjoy the taste of butter and lose over 2.5 stones in 5 months (+ another 5 lbs since I reached target). And I eat it on sandwiches.
The family would walk over glass for my mashed potatoes with Dromona in it.
However, I have never tried baking with it - but no news there, as I'm useless.
As O-G says, just use less butter.
Try Babybel light and Laughing Cow light cheese as well.