Coming from a Dell Streak...I was never going to use a phone smaller than 5".
I used my Streak a lot in the train watching Movies. I use it quite a lot around the house doing web browsing and Youtubing
My reason for the Note from the Streak is because of the Super Amoled screen. I have fallen in love with the Amoled screen since my first Samsung Phone (I8910)
so...there you go, some of my reasons.
ps. 5" phone is not that big....seriously