I have not heard about "attachment" parenting but basing on what I read here I think I could say this:-

BALANCE is the KEY. Too much of one thing, even the very best of things could be harmful.

All kids are different. The important thing is to really know them well and give them the appropriate huddles to cross at the right level and at the right time.

I am open to sleeping with my kids if there is a need. My son is 9 and came back to our bed because of a recent intense fear. I love that feeling of cuddling up close to him. Those feelings I get when I look into his face when he is asleep is magical. And sometimes waking up together on the same bed gave us an opportunity to play like hugging and rolling about. That feeling of deep intimate connection between us are so beautiful - It is the Real TREASURE in life.

On the other hand, I would encourage him to sleep by himself, to do thing for himself. And take the progress appropriately.

My daughter was brought up the same but she got independent and move on to be by herself and have been very happy by herself ever since.

Both my kids seems to be very independent in many areas of their life. She does all her homework well and on time without being pushed or reminded. He needs a little but is getting more and more self-reliant on handling all assignments. They would go to bed on time, wake themselves up in good time, cook their own breakfast and get ready for school and leave on time for school without my instruction. (Initially I did have to guide them but not anymore). They are now 12 (daughter) and 9 (son). As independent is concern I think they are doing pretty well.

In school, they are always rated to display higher level thinking skills. Beside independence I am proud that they are natural high achievers. Both of them get straight A almost every year.

I don't exactly know what I did right, I know I also unconsciously pass onto them a lot of bad stuff. I do have a lot of issues (for e.g. explosive anger when sensitive areas get touch or when I am in my PMS/menopause). When I am in those mood, I can be very critical. One thing I suspect I did right is to be myself, not to hide anything or be pretentious. I constantly strife to be conscious and when I went out of whack, I apologize when I can and learn from it. (I think my kids are learning that from me as well, they sometimes write apology note to me). As much as possible we want to live a life with high integrity. Live to love and to learn to be a better person everyday.