Face it. 4E has completely divorced itself from any form of realism, simulation, versimulatude, believablity, etc.
When was D&D ever married to simulation, believability, or realism?
I'm not trying to convince you 4e is good. Or even that you're wrong. Or pull teeth

.
It's just that I've played D&D for 25+ years, starting with AD&D, and I just don't see how the rules ever supported simulation. They were always gamist.
From my perspective, some people around here are mistaking realism (and simulation) for
tradition. It's not that 4e is any less
realistic, it's that 4e is unrealistic in several
new ways, which they haven't spent the last 30 years getting used to.
Once upon a time, as ardoughter mentioned, I too asked why (and how) a PC standing in a room without cover got a save vs. the Fireball erupting all around him. And why, if he made his save, was he in the same spot? Wasn't he diving out of the way?
I stopped asking these question. Roughly around the time I stopped thinking it was a good idea to extrapolate a setting's natural laws from the game rules. That way lies madness, not to mention the inevitable loss of realism, simulation, verisimilitude, believability, etc...