I know quite a few women who feel strongly that breast feeding for at least a year is good for their baby, and they have busy lives so do make use of any facilities that are conducive to breast feeding when they meet up with friends. I have sat in a cafe whilst my friend has breast fed her baby, with my own babies who I would feed if they needed it (I usually would feed the babies before going out, but sometimes timings just don't work, or babies need pacifying by offering them the breast).
I don't see being enthusiastic about breast feeding as earning the activist label - they are just enthusiastic - a baby who doesn't need or want to feed won't bother.
When I look around places like the Trafford Centre, I see many more young women bottle feeding their babies in public - how come this isn't noticed?