Fwiw, I really don't know anyone who was (1) breastfeeding 1 year old DC, and (2) co-sleeping with 1 year old DC.
Actually, no, I do know one mum who was co-sleeping with her 2 year old DD and was in tears about it. She had followed 'attachment parenting' and just couldn't take it anymore that her DD was still 'attached' to her - wouldn't go to sleep anywhere but in their bed, incredibly clingy, wouldn't settle with anyone (including her dad) but her.
She gave up on co-sleeping, had several tough nights but her DD now sleeps in her own room. Meanwhile, she recently gave birth to another child and is not following attachment parenting stuff with him. I think she did use the term "rod for my back" 
Apart from her, no, I don't know anyone who co-slept with a toddler. Another friend was taking her DD to bed when she woke up every day at the unGodly hour of 5 AM but was awfully down about it. She finally said "no" one day to her DD and never looked back.
It's all about what you can live with, really. If you are happy with DC in your bed for years, then hooray for you. We are happy with DC who happily go to sleep in their own beds and don't rise until 7 AM at the earliest, and we have done what was necessary to achieve this.