I haven't but thought i'd give the view of the other guy!
I don't really understand why people find out the sex and then don't tell others. If you don't want it to be a surprise to you, what makes you think others do? It's just annoying more than anything! It's your baby not mine so i don't have a preference either way but if you already know, then it would be nice to buy some gender appropriate clothing!
PS: I say you, not meaning you OP or anyone else, just meaning you in general, as in you people who find out the gender and then don't tell! Lol!
Your mind is a garden, your thoughts are the seeds,
You can grow flowers or you can grow weeds.