Hi Calculusaurus,
It sounds like you may be going about this backwards. Instead of trying to figure out whether to go to grad school or not, why don't you talk to people in the field or fields that you want to go into (like computational neuroscience). For example, you can talk to computational neuroscientists and ask them:
1. What do you like about your career and what can be improved about it?
2. What is your educational background?
3. What were the most important lessons you learned from your educational background?
4. Do you have any recommendations in terms of good grad schools or how to succeed in grad school?
My story: I graduated with a liberal arts degree, I have a full time job in the information technology industry, and in my spare time I'm reading a few hundred books on business and technology as well as thousands of abstracts from papers published in business and scientific journals. This is an unusual path, and I don't know how it will turn out, but I wanted to do it this way because it is different.
In the story of the Hedgehog and the Fox, I am the fox:
The Hedgehog and the Fox - Wikipedia, the free encyclopedia