I too get the giggles from others when I tell I have an active profile and/or am going to meet someone I've only talked on-line with before.
Sadly, I've never actually had a successful romantic relationship that developed entirely out of on-line dating. Have made some cool friends, though. I think it's because you can't figure if you are actually sexually attracted to someone out of pictures only, so the people I have gone to meet have not been attracted to me that way.
On the other hand, sometimes attraction develops over time or I am totally attracted to someone I've never even seen a photo of, so I think I've just had a stint of bad luck.
Maybe there is that one special programmer for everyone out there