What you described is a common, nearly standart thing in every other mmo when it comes to dungeons / Raids / strikes / etc. After a few times, you know everything and just want to push through it. This "running through everything to make things faster" works pretty well in every other mmo, but mainly because you can coordinate with your teammates via chat. Now as Destiny doesn't have the chat possibility it may be a problem for other players who never played a mmo before in such a hardcore way. Please don't forget that this "shared world shooter" is the first big FPS entrance in the mmo genre.