Oh definitely, I have felt very confused over the years about this, wishing other people would be as considerate as me and wondering why they weren't. Then realising slowly that I was getting trampled all over. I am far better at saying 'No!' now, but still fall into the trap on occasion.
I have been watching a friend over the past five years, since she moved here. She cannot say No, childminds all her GCs and gets the older one to school and back miles away (and there is another on the way), is out every evening on village meetings because she is secretary to every club and PC and fund-raiser, and then spends the weekends 'supporting' her husband at his sporting efforts, out in the cold and mud, all year round. All I can say is, she has aged considerably over these past five years. She moved down to be nearer to her daughters but I don't think she realised how much they, as well as the village, would expect of her. I do tell her she does too much, she says 'Oh, I don't mind really' - and then has a bit of a moan a couple of days later!