Originally Posted by Kalman

APM isn't the same thing as skill. Timing and tactics are far more skillful than button mashing. Further, the GCD serves an important function by forcing you to commit to an action; reduce or eliminate it, and the whole tactical aspect of move-counter is significantly reduced, to the level of a twitch game, which WoW is not and shouldn't become.

Reducing GCD really wouldn't result in more actions being taken, either; casters still have to cast, which is generally an action at or greater than the GCD. The main result would really be increasing damage burst, since AP-PoM-Pyro-FiBl suddenly becomes a 1 second combo, not a 1.5, since ambush-BS is now 1s, etc. As Blizzard is trying to move the PvP game away from the rapid burst game it once was towards a more strategic/tactical game where players can survive burst for long enough for healing classes to react, this whole discussion is counter to the obvious trend of the game.

In short: it's a bad idea, since it would make PvP less interesting and more of a twitch game, and it's also directly counter to the observed intentions of the designers.