I've only been surprised, so I can't really say. I will definitely wait for the next baby too.
My sister's friend has a story. Their first was a girl. With the second baby the dad really wanted a boy. So at the big ultrasound when they found out that they were having another girl, he was very disappointed. Very disappointed. He really rejected the pregnancy for several weeks. It took him a while to turn around, and didn't completely realize that what he was feeling was inappropriate (for lack of a better word :?: ) until that baby girl was born. When he saw her, he realized that every bit of disappointment he felt was foolish and selfish because the baby was just plain and simple...love. So for their third, they decided not to find out because that period of disappointment was so...shameful (sorry, I'm having a hard time with words today!). They ended up having a boy! The moral of the story is, and this is from that dad's POV, if you have any expectations or believe you will experience any disappointment, save yourself from those feelings and wait till delivery, because then...it really doesn't matter.
Something to think about! I know there are other issues to consider, but that's a true story and one that makes total sense to me.