I, personally, think that going on a herpes dating website is making yourself your disease, instead of herpes only being what you have. I don't think I would ever date somebody simply because they have the same problem as me. I don't know. I guess, I'd just think about the disease a lot more frequently than I already do.
I don't believe you necessarily have to start dating somebody and immediately tell them about your condition (unless, of course, you plan on sleeping with them right away... then you definitely SHOULD). Give any ole' Joe the chance to get to know you, then inform him once things get to that point.
There's no reason why you need to limit your options because of a disease!