Yes that is the main encounter design problem in MMOs anymore. It is Dance Dance Raiding rather than actually having a strategic or tactical nature. I would love to see encounters designed based upon a Tower Defense scenario, maybe even involving the placement of assess in the field, like the South Park Tower Defense game. There is also a WW2ish alternative world Tower Defense game that is a first person shooter. You can even have variable/scale-able rewards based upon how much assistance the group/raid uses to complete. More resources expended less reward.

Twitch gaming is over-rated and is more about learning what order to press your movement buttons than actually reacting to in-game cues.