I don't get irritated by the small screen size at all. I recognize the phone for what it is- a small, pocket sized device that connects me to a lot of incredible places at the touch of a few keys. I don't expect it to completely replace my laptop or desktop.
whilst that is true, it still annoys me that when in vertical mode the keyboard basically covers up the entire screen - this makes it extremely hard when typing long messages, and editing them!
Oh look, I agree that there are things that could make the viewing a LOT more pleasant an experience. Believe me, as my eyes have gotten older (unlike the rest of me!) small fonts are a pain, and obtrusive keyboards are as well.
And it wasn't my intention to criticize those who find the constraints of the screen size needlessly limiting. I just think that, sometimes, we focus too much on what something CAN'T do as opposed to being amazed at what it CAN do. But I wouldn't want the physical form factor of the iPhone to change radically. I like the compact size. But I also wouldn't object to them adding screen size within the same physical design.
My next phone will definitely have a 4" or larger screen......Apple or not.....