I bf DS1 and DS2 each for a year, and am still bf 9mo DD.
I don't express at all - tried a couple of times and it took ages to get a tiny bit of milk. I am fortunate in that my lifestyle enables me to manage without expressing - I work from home and have a part-time nanny, so I can break off and take the baby for a bf whenever required.
But I just wondered if it is unusual not to express. The thread about Amazon advertising a 'complete breastfeeding set' comprising pump & bottles etc. made me think of it. I have never bought/used a bottle. Is expressing part and parcel of bf for most mothers?