Think I'm not one of the hip, geeky and techy guys any more :-(
A smartphone comes handy on the road for doing all the things you mentioned but I still see it as a phone in first place - I'm using it between office and home and ... for the quick mail answer, quick news update, sms, having a look on a document that can't wait to be reviewed till I'm on a computer or tablet and often for navigation and as a camera but very rare for YouTube or a movie ... It's cool to have a little device in the pocket that can do nearly everthing a computer can do on the road - but I don't (I really don't ) want to carry a tablet sized brick in my pocket all the time ... But I'm old, so maybe I just don't get the point ...

For movies I prefer a real big screen (still going to cinemas though ;-) ) for reading an ebook reader and for real work on documents a notebook with a hardware keyboard (a tablet might do but not a 7inch)

From the people around me 40% like 5" plus devices, 40% want nothing bigger then 4.5, 10% don't care as long they get a hardware keyboard and 10% are still happy with their K800i or even a 3210 ;-)

Oh and btw: why this discussion in the never-ending-tablet-thread ;-)