When i'm charging my i5 i always go back to my 4s and yes the 4s screen is tiny, but i still like it since not all the apps i use are updated for the i5 yet. But i loooove the i5 taller screen for sure... The best feature of the phone!
I've kept my 4 as an emergency/spare phone ( pretty sure my 5's battery won't last for a whole weekend camp without being charged - the 4's never did) and the scree feels really tiny compared to the 5.
As others have said, if you still have a device with the 3.5 inch screen, go use it, and then go back to your iPhone 5. My old iPod Touch seems like a stubby little thing now that I've gotten used to the dimensions of the 5.