Here's how I see the 5 min rest thing playing out...
DM: "Okay, you've fought back the goblin horde. Now what do you want to do?"
Human Cleric: "I suggest we take a 5 minute rest."
Dwarf Fighter: "I agree. I'm using up some Healing Surges."
Dramatist Wizard: (in character, of course) "We cannot tarry. The princess is held captive! If I must press on, I shall!"
His Buddy the Ranger: "No, Shalalzamor! You cannot go alone. These caverns are too dangerous!"
DM: "And what are you doing Steve?"
Shifty Rogue: "Oh man, I'm totally looting these bodies. Who's in?"
Cleric: "Oh, I'm going for the Shaman!"
Fighter: "Me too? What do I roll?"
Dramatist Wizard: "But my love... Princess Penelope!"
Shifty Rogue: "Dude! I just picked up a scroll!"
The more things change...
