I'm a web developer, so that's about as much as I do with security. So I'm not a security professional.

Disabling JS could increase general browsing security, but there's much better things people should be worrying about. Like verifying URLs. Going to sites you trust. Watching what you click. Installing an anti-virus. And keeping it updated. Installing updates and patches.

Install noscript if you must disable JS. Then it can at least be selective (haven't used, so I assume that's the case).