"Aren't TVs big enough?"
No. I've got a 40-incher (ooo-er missus) which felt big when I got it but it's not.
I think I would have to go pretty large - and beyond the room and budget I have - to be able to appreciate the opening scene of A Clockwork Orange as intended, even Star Wars.
I could probably think of other examples which really demand 'huge screen presentation' and rather pale on anything smaller.
I suppose I could sit closer to the TV :-)