After spending the last two and half years of my time in WoW raiding, most of which was on progression content in one of the top raiding guilds on my server, I've learned to be extremely focused on my task and trusting my team-mates to do the same. Raid content in WoW, particularly in the Sunwell, was so tightly tuned that there was no room for generalists. You had a job, and you did that job, and while you were aware of the other aspects of the encounter you simply didn't have time to worry about what was going on outside of your assigned role. I played a warlock primarily and in Burning Crusade that meant I killed things because we were overpowered and we were the best at it. In particular I was specced destruction and so I put up my curse and then spammed shadowbolt until my target died. I was vaguely aware of the tank's health because I had a target of target unit frame and kept an eye on it to make sure it was not me, but beyond that I wasn't concerned with the status of everyone else. Minimizing the delay between casts and not standing in the fire were the priorities.
Transitioning back to small group play in a completely different game requires a much different degree of situational awareness. Fewer comrades means gaps in specialist coverage. Flexibility is rewarded to a much greater degree. The loss of a party member goes from "Druid, BR!" to "Crap, here comes the wipe." The presence of fellowship manuevers in LotRO take this to an extreme however. A properly executed FM means your DPS is just as responsible for healing and power regeneration as your healers. It means that your minstrel and tank are just as responsible for killing mobs as your DPS. The options available to you from an FM are incredible and they are very easily capable of turning a wipe into an heroic victory. A botched one can also turn a close battle into a rout and a trip back to the defeat circle. The number of different maneuvers available guarantee there is one for any occasion.
And therein lies the problem. Which one do you pick when there is only a seven second window to select the target of the FM, choose your color, and make sure you press that button in right order with the other five people in your fellowship? A hunter sees a mob that needs to die, so he picks damage. A tank sees that his morale bar is low so he picks healing. A healer is running low on power so he picks power regen. Suddenly an opportunity to make a pivotal shift in the battle decays into an ineffective jumble of random colors. How do we learn to see the whole battle when we've been trained to focus, focus, focus? In my opinion this is what is separating us from being a collection of good individual players to being a well-oiled machine that mows down the minions of Sauron.