"You can probably coast your way into some me-too start-up, but if you want a good job at a company you're excited about it, you have to prove your worth by selling yourself."

Bravo! In my own experience: the worst mistake I have made in my career is not seeking out more exciting and challenging opportunities and instead taking what came easily. The best opportunities of my career have been the difficult to attain and the best challenges have been those difficult to complete.

This post proves it: email and resume blasting is not a useful method for good job hunting.