Cara - it's interesting what people will do with the knowledge. It is true that something like 90% of babies confirmed by amniocentesis to have DS are terminated. So theoretically only 10% who have an amnio are using that knowledge to "prepare". Many like you opt not to have an amnio if they wouldn't terminate anyway. I personally would have been like that as well - but my husband was one who wanted to know, so we decided together to go ahead with it. He's the same with everything - Christmas presents, gender of the baby, everything!
In our pregnancy, I really had an emotionally hard pregnancy - I even partially prepared myself for losing her, started thinking about funeral plans, whether we would repatriate her body back to Aus, etc... But when she was born, I really hit the ground running in many ways.
My husband, on the other hand, although he wanted to know, didn't process as much during the pregnancy. There was good and bad to that - he never really dealt with the trauma of perhaps losing her - but that turned out to be unnecessary anyway. When she was born, though, he struggled a lot more with the reality of what her condition meant for her and for us as a family.
It's kind of ironic that even though he was the one who really wanted to find out, but I was the one who it probably affected the most. Even if we didn't want to find out though, my daughter's condition is primarily a skeletal one and so it's strikingly obvious to any qualified obgyn on ultrasound and we couldn't have avoided finding out, unless we had no ultrasounds after 14 weeks or so.
Screening for DS is in the future going to become much "easier", there are diagnostic tests that can now be done in the first trimester by picking up fetal blood from the mother's bloodstream. The test, like amnio, is conclusive - AND it is non-invasive and hence has no risk of miscarriage. Within our life time, it probably will become routine and sadly may lead to more terminations of babies with DS as it is often "easier" for a woman to terminate in the first trimester before the baby starts kicking and maybe even before they have even announced their pregnancy...
Here's the link to the new diagnostic DS test if anyone is interested:
http://abcnews.go.com/blogs/health/2011/10/18/safer-down-syndrome-test-to-hit-market-monday/ - it's very accurate and can detect DS at only 10 weeks...