For a while there was a potion sickness effect in the beta of Wrath of the Lich King that kept people from consuming more than one potion per fight. I really hope this mechanic makes it into the actual game.
For those of you who didn’t raid before Burning Crusade, it wasn’t uncommon to have six or more elixir buffs up for progression raiding. Raiding was an even more expensive proposition then. Elixirs were then divided into Battle and Guardian elixirs and you could only have one of each or a flask up. There was a great hue and cry that raid bosses would be impossible to beat. Shockingly enough, the sky didn’t fall and there was still plenty of raiding and downing of raid bosses.
Anything that reduces the cost of raiding is fine by me!