Re: "In doctors, you might expect a good one to use more technical language"
In a job interview, you're very probably dealing with HR rather than another medical person.
So the ability to explain things in layman's terms without actively sounding like you're talking down is very much an important skill, and one that a good doc will use with some frequency.
That's true of most trades that do any customer/client-facing roles, I'd think. If you can't explain it in a number of ways, odds are you don't understand it as well as you perhaps could.