P. - First, you are not alone, and you are not crazy, and you are not being too uptight! I applaud the fact that you are trying to monitor what your kids watch and learn from the TV, media, etc. You and I could probably have a three hour conversation about it, bc I feel exactly the same why. And I have found a few other friends who feel the same, but not many. I cannot believe, first, what garbage is on TV today for kids, and second, that parents don't seem to have a problem w/ their kids watching it!! I believe a parent's number one job is to protect their kids and keep them safe....not just from predators, and physical dangers, but also from negative influences like the media. Kids are growing up so fast b/c of what they are exposed to at young ages. It's really sad.
Anyway, off my soapbox....I have an almost six year old girl who is still watching Calliou, Berenstain Bears, Franklin, etc. My seven year old son has just started to ask to watch Ben 10, Johnny Test, Danny Phantom, and The Clone Wars. I'm not big fans of these shows - I don't feel like there are many life lessons in the plot, it's more just for entertainment. So I limit how many he can watch, and I push for Ben 10 bc that seems to be the best one in my opinion. I'm a bit lax on the violence part - I feel like kids have been playing cops and robbers and cowboys and indians for ages, but I do not let them watch any older shows with portrayals of violence. They're not allowed to watch any grown up shows, including PG movies, American Idol, DWTS, etc. Believe me, they are anomalies at school and with their friends. But I don't care! My job isn't to be popular, it's to protect them! I despise Spongebob too, for the same reasons you mentioned. He's not exactly a good role model! My kids enjoy Tom and Jerry! Would you consider that? What about DVD's instead? I basically tell them, these are your choices of what you can watch, if you don't like the choices, then do something else. You are the parent, and shouldn't allow them to watch something you feel is inappropriate. Shame on the parents whose kids say a show is too babyish and they give in and let them watch something they shouldn't! Who is in charge? Did your parents do that? I know mine didn't! I explain to my kids that some shows have themes, scenes, that aren't okay for them, and help them understand where I'm coming from. They might not like it, but they will respect the parent who behaves that way, and will learn from it. Hannah Montana is a teenager - so teens should be watching her, not four year olds! Kids totally pick up on the sexual innuendo, and think that is cool, and begin to act it out. Unfortunately, their minds aren't mature enough to process what it really means.
One book I found informative, albeit disturbing, is "The Lolita Effect" by M Gigi Durham. You might want to pick it up to reinforce the fact that you are not crazy.
Good luck with it, and remember that you are being a great mom!!