a lot of times, when people get to know you and see how diabetes doesn't bother you or affect who you are as a person, it won't bother them either. i can't say i've dated too many people, but for those i have, diabetes wasn't a big deal to them. they knew the basics and what to do if something went wrong, but they cared about me as a person - diabetes was just one of my many (amazing) traits :o)
i don't typically bring diabetes up either. by no means do i go around hiding it, but my personal health isn't something i chat about when i'm looking for a date. it usually eventually comes up, and i'm always open and honest about it. if someone doesn't like you because of diabetes, they probably aren't worth knowing anyway.
if you feel comfortable enough, you can use it as a teaching opportunity. sometimes a person's fear of a disease is simply based on a lack of knowledge and understanding. you can provide them with the education, and they might just change their mind about the disease and about you. essentially, it's all about how YOU handle it. if you present yourself in a manner where you're embarrassed of diabetes, don't ever want to talk about it, or hide it, someone might get the impression the disease is something really terrible. let me tell you, confidence in a man truly means everything.