I'm a little disappointed in the lack of support for the additional education in ethics. The ethical problems associated with medicine are only becoming more and more complicated and as such it is often difficult for someone to deal with the really difficult issues without advanced training in the field.
Bottom line, any class that you take is likely to impact your education in some way or another. The problem with philosophy/ethics classes is that often the result isn't as direct as others. For instance, if you want to learn how to treat the cardiovascular system, well they have a class for that. However taking a philosophy class educates you not in treating diseases, but rather by addressing problems that aren't as easily answered as that of science. That is the reason philosophy is such a difficult field, it deals with more subject matter than science does (and also probably why it doesn't receive as much credit as well, the scientific method works, but not for everything!). If nothing else you will learn more analysis and critical thinking, which is different than that involved in science classes. I have heard many medical school are interested in having students do this, and will make it easier for them than you would believe (i.e. give you money to do it).
In general, if you wish to do excellent philosophy you need advanced training. I'm a little disappointed with JDovers saying it is an amateurish sport; if you really want to impact the field it takes a lot of work. It is only considered amateurish because there are many "coffee shop" philosophers. It's a tough field, and to do it well you need considerable education and mentoring by those who have been there. Undergraduate training starts one off on the field of critical thinking, but graduate studies helps one become an active contributer to the field.
Bioethics more than others seems to attract a lot of half-thought up ideas and opinions than other fields due to its very personal nature. I guess it boils down to how you think you can impact the field of medicine, which is in dire need of more physicians helping out in ethical situations. If you want to do it, it will be a great service to the field!