I appreciate the passionate argument, but it only holds in a small corner of the problem space. Data visualization is a surprisingly old subject, and it's been given a thorough treatment by a long list of distinguished researchers. The good news is that, although advanced research continues, the day to day needs of the average jane/joe are covered. When it comes time to present data, we have ridiculously powerful tools now that are literally under our noses, and they will handle the majority of our needs right out of the box. For the record, I count 74 different chart types in Excel. Seriously, Excel!
Occasionally -- I would even say rarely -- we may find it necessary to create more complex or specialized representations; the good news here is that self-education in this Internet age is all too simple. Go read a book by an expert like Tufte. If that's not enough, you can take courses from some of the masters without even leaving your office, for pete's sake.
Let's skip over the bit about artists and left brain vs right brain (complete myth, by the way: http://www.psychologytoday.com/blog/brain-myths/201206/why-the-left-brain-right-brain-myth-will-probably-never-die). At bottom, it is obviously true that people have different strengths and interests. However, most of our daily work presenting facts and figures will not require exceptional ability. Sometimes, again rarely, a breakthrough visualization method means the difference between communication and confusion, c.f. Feynman Diagrams. Most of the time, almost all of the time, that's just not the case.
Here's the secret to effective data presentation, and it's been rediscovered so often it's not even funny. Keep it as simple as possible. And to be honest, it doesn't take an expert to do that.