In the spirit of modern life, medicalization of normalcy and so forth, I sometimes resort to calling it "Too Many Interests Syndrome."
Somehow, it seems to affect HSPs/Autism Spectrum people more... likely has to do with "paying attention" and "noticing" more. But when we catch every thought and idea that comes by, it soon leads to a sense of feeling completely overwhelmed, then moment we start thinking about having to complete everything. At least it does for me...
Yes, I'm sure it's related to the tendency to follow every train of thought (everybody knows autists like trains, right?), which I enjoy thoroughly, but generally doesn't lead to anything you could publish or sell.