I am SO glad you posted this. its a distinction that i too have been contemplating recently .
My background is as a Corporate Trainer and Development Director and its been extremely useful in my current role as LMS Administrator because what ends up happening is that we have all these SMEs with their own content in various formats mainly power points and different strengths which usually does not inc training they just happen to be experts in a specific topic or skill area, i work with these individuals to build their online courses. My job is not only to convert a SMEs content into a usable online module but to also followup and look for trends in learning and offer suggestions to improve engagement. I work closely with HR to help push initiatives using our LMS.
its more than just instructional design but also varies by employer hence why there is such a struggle to agree on a label. i was also thinking of titles that better describe what i do and while i still havent found the best one, i like Learning Architect.