In practical terms, which GPU do most MBP users leave on? It's a PAIN to switch between them since you have to log off/on. Is there a list out there that says which types of apps you should use with the higher-end card? Or do most people just leave it on anyway? Is it only for high-end video tasks (3D rendering, gaming, video encoding) or do other tasks benefit from the higher-end GPU? If I'm importing a huge photo library in iPhoto (and it does all of its thumbnail creation and faces, etc), will that benefit from the higher-end GPU?