Some people think that "bisexual" emphasizes too much on gender polarity (meanwhile, some who are attracted strictly to masculine men and feminine women say it is appropriate for them). Pansexual and omnisexual I think mean the same thing: attracted to any type of person, or gender not mattering in who they love. "Queer" has also become a catch-all phrase, too. And I think there are even more descriptive words: I have heard "pomosexual" which might mean "post-sexual orientation" and other words.
I feel a little presumptuous calling myself queer, and with pansexual I don't know if some people will interpret that as "will sleep with anyone". I just stick with bisexual. I am attracted to both men and women, and people in between and at all levels of masculine and feminine, but I do want both males and females in my life.
What do people think about all the different labels? Are they divisive at all or contributing to "bisexual invisibility"? I mean some people actually will say "I'm not bisexual, I'm--" But then, some words are more descriptive for some people and people should use whatever description they like. Not like I would argue passionately either way, though--it's about like "should bisexuals try to be part of the gay community or form their own separate community?"
I'd say yes and yes. We have our own specific concerns, and we share the wider LGBTQI* community's concern about being able to live and love as who we are, without being forced into "straight and narrow" boxes.