We'll definitely be taking one. Both our sets of parents are taking one (their own decision, not us pushing!) & my sister wants to take one, too. The classes our hospital offer also go over some first aid & such, so it sounds like a pretty good use of time to me!
Strange that your doc "really hasn't heard of people taking these." My midwife gave me a brochure about available classes at my very first appointment & asked yesterday if we're planning on taking the CPR class, specifically. The ped we chose also asked during our interview with her if we were planning on taking a CPR class. They both seemed to think it was a good thing to do.