Hi SerraAvatar. I am new to this wonderful forum, but not new to chemforums and chemistry. I did my B.Sc in pharmaceutical and biological chemistry, and continuing into a grad education in chemistry.
During my 4 years of that applied B.Sc. program, I had a chance to take about 1 full year of courses, other than a normal chemistry program core, that were opened for biochemists (advanced biochem courses) and starting pharmacists and pharmacologists.
I was always wondering what way to go, in order to develop a connection of hardcore chemistry and medicinal applications of it, and I at the end stayed in chemistry. The reason for that is that without a through understanding of organic chemistry, you would depend on a chemist to to the hard job of thinking and telling you which of your ideas will or will not work, physically and realistically.
Organic chemistry is the key to all understanding in all related fields; without it people only know names of molecules, without having an understanding of the true basis of actions of molecules in living systems. In order to succeed, you need to have a chemical sense.
Biologists (sorry if I offend anyone), know only the result, without getting into the real, physical reasons. Biochemists are generally the ones who have troubles with the scientific core of chemistry, but their emphasis, instead, is put onto the qualitative classification of molecular systems. I would define Biochemistry as science of "macroscopic chemistry".
A biochemist (as well as a pharmacologist) will often come to a chemist to tell him what molecule he wants to be made to achieve the goal. (it's all simplified, but I hope you will get the point).
I can write forever... But in short, what I wanted to say is that it is rare for a chemist to have a bio-related knowledge, but if "it" does have it, then "it" can develop much more directed things than one that doesn't try to learn either one of the fields. It's like all in one - a biologist and a creator. It helps.
To conclude all this jabbering, I would say that organic chemistry is the most valuable subject for pharma related people. The deeper you go into it, the better results you will get to. Bio/Pharma knowledge is something that can be learned on the side, but organic chemistry will tell you all about where it comes from.
There is a difference between having a key and borrowing it.