I had the 12wk neuchal scan and the usual 20wk scan with all of them.
I would do it again too. If I found out that I had a special needs child at the 12wk I would still go on and just research my little heart out. You just never know, they can get it wrong. I knew of someone told they were carrying a downes baby, they continued on to produce a baby with no special needs at all other than the love of Mum and Dad.
I too love seeing the 'little person' on the scan...makes it all the more real, especially if you are not having any pregnancy symptoms.
I also wouldn't judge anyone who chose to terminate for whatever reason after finding 'something wrong'..that is their choice.