Actually, although most of us think we've forgotten most of our biochemistry (and we probably have), there was a lot of stuff in there, and a lot of it was important. You're remembering it today because it keeps getting repeated though, and you don't think of it as biochemistry anymore.
All that cAMP, receptors, and cell activation stuff.. sure we do that in pharmacology, but it's part of biochem. It's important for oncology. And if you want to know endocrinology, then that's all biochem too. And actually, most consultants I've run into whether they were cardiologists or respiratory medicine specialists, all know their molecules and biochem. They can talk to you in detail about different enzymes and cell receptors or the molecular basis of how Omega 3 fatty acids work, because a lot of recent studies which consultants keep up to date with are based on this stuff.
Biochem sucked because we had to memorize cycles, but I think it's all relevant. Although you might be happy to generally know that a lack of Vit C in the diet can cause bleeding gums, a kid at school can tell you that as well. Without biochem, how are you supposed to know how Vit C is involved in collagen linking? That kind of molecular thinking is what research is all about and what you'll run into in studies when you're forced to read them.
I read this medical thriller novel once written by Michael Crichton under an alias, and one of the characters in the story was some big shot surgeon who shouted at everyone. But the surgeon was being tough with everyone because he was trained in a time when biochemistry and other molecular studies weren't important in medicine, and they just focused on anatomy and physiology. He didn't know anything about molecules, and he was afraid of the new doctors because they were more up-to-date.
I can think of loads of ways of how biochem is important in medicine. There's lactose intolerance, alcohol toxicity.. things about differences in genes/geographical variation and people's ability to handle certain foods.. the whole genetic system..
What do you think biochemistry is about?