Maybe it's true, to an extent? Big emotional experiences can certainly feed your work. There's a reason why every second rate indie band and their cousin has a break-up album, all snivelling ballads and 'eff-you' declarations of moving on to better things.
Of course, it doesn't always make it good.
Right now, I'm finding emotional turmoil is getting in the way of getting on with stuff. Because all the time I spend angsting about and staring moodily into the middle distance is time I'm not spending getting on with actual writing. All the mental energy I'm expending on little questions - like what am I going to do with the rest of my life - leaves me much much less to spare for being creative in any way. Thinking of a mildly intelligent facebook status update is a challenge right now.
Hoping for a bit of stability soon. Not so much as to make life boring, but enough that I can happily sit typing up the latest script (there is one, I have ideas, hell, I have notes) for a few hours without stressing wildly over job applications, preparing to move country, wondering what I'm doing with my life/career/everything else...