Nebulous
Legend
I find that my power-gaming players always want to take a 5 minute rest after an encounter so they are fully healed and encounter powers restored before they move on.
Like others said, Healing Surges are probably more important in 4e than actual hit points. If your players go into an encounter with full hit points and all encounter powers but with 1 HS a piece, someone is going to die. The trickier part for a DM is whittling down those surges in a logical manner while preventing the PCs from taking daily rests and jumping back up at max strength.