My initial impression in 4e that a player's choices will take longer, but there execution will be shorter.
The question is what takes longer: a 20th level fighter in 3e deciding to attack, then rolling 4 attack rolls with modifiers, then rolling 4 damage rolls with modifiers, adding all the damage and then giving that to the DM vs a 4e fighter taking a bit to decide what power to use, rolling one attack roll and damage roll, adding the damage, and giving that to the DM.
And of course the more important question: which is more fun?
The question is what takes longer: a 20th level fighter in 3e deciding to attack, then rolling 4 attack rolls with modifiers, then rolling 4 damage rolls with modifiers, adding all the damage and then giving that to the DM vs a 4e fighter taking a bit to decide what power to use, rolling one attack roll and damage roll, adding the damage, and giving that to the DM.
And of course the more important question: which is more fun?