Perhaps it would work if I didn't have access to the internet and/or lived in a more nature-like area. Or perhaps it would work if my lifestyle was already different. I don't know. But as it is, if I smoke I become either couch-locked or jittery and paranoid.
I think individual differences matter a great deal, and you're right in pointing that out.
That said, the vast majority of regular pot smokers I know are more similar to me than they are to you, so based on that I think the negative bias is at least somewhat justified. I'd never tell someone not to smoke, I wouldn't judge chronic smokers no matter their lifestyle. But I've warned every one of my siblings and those curious about it to keep an eye out for how they respond to the stuff. It's nowhere near as potentially dangerous as alcohol, I think, but it's also not quite like picking up a coffee habit.
(I do have to confirm that I would occasionally get a burst of 'creativity' in particular when coding on purely-fun side-projects! Doing so was enjoyable and funny albeit not always very productive. I miss that sometimes.)
That said, I personally don't feel comfortable indulging in something chronically that has such pronounced effect on my mental abilities. Even if it has no long-term physical consequences, the habit (and what comes with it: junk food, junk tv, lethargy, etc.) itself can't be ideal.