I believe it is all relative.
It may be a different type of stress, but stressful all the same. CEO's, CRNA's, PharmD's, Accountants and Realtors all have perceived work stresses, but to say one is less than other just because it is in a different environment doesn't mean one should downplay it. Sure, lives may not be in their hands, but a lot of money, people's jobs, and supporting a family are all stressors.
Oddly enough (and with a grain of salt) not a single healthcare profession made it into Forbes list of top 10 stressful jobs... most of the jobs held no live's in their hands (with the exception of airline pilots and fire fighters).