But your average engineering or computer science major at a reputable program has to take far more difficult math than your typical premed.
Look through the requirements for medical school admission, and you'll see many do not require more than a single year of calculus.
UCSD, for instance, even provides an easier track of calculus and physics for biology majors, perfectly acceptable for medical school, but unacceptable for math, physics, or most computer science or engineering majors.
http://ucsd.edu/catalog/curric/BIOL-ug.html#major
Yes, I know that anyone is allowed to read a book on PHP and hang out a shingle as a "computer professional", so if you're including them, then sure, I guess the average doctor has a better handle on math. And honestly, I'm glad that this kind of freedom exists in the world of software. But I hope you realize that the math background of a typical CS major from a good university greatly exceeds what is required to go to med school.