I think it's always interesting to know how a system works if your work relies on it. I don't mean you should learn every bit of it, but still get a good understanding, at least to be able to search more by yourself the day you will have to.
Software is not magic - well... ok... for 99% of the cases :-)
Here is a link to an excellent article about "magical thinking" and "GUID goblins" from Eric Lippert's about that subject: It's not Magic
