I didn't think that most of your reaction timings would be slow.It has little to do with reaction time. Hardly anyone has the near-lightning like connection speed that you do. I can outrun most people, and you usually leave me behind unless I can get you off your horse.
Connection speed is the single most important factor in PVP, so most people who aren't at least as fast as I am leave Felucca and never look back because there's just nothing they can do to overcome that kind of handicap. So if you spend a fair amount of time in Felucca, I can understand why the relative slowness of the majority of Britannians can come as a surprise.
Plus...no group can ever move as fast as a handful of people, even if it is a well organized group. Groups of people who aren't used to hunting together are even worse...this is why we make the Fara leader a rotational thing. If you lead one of these hunts, you understand better and eventually as more people take their turns leading it makes the group far more cohesive.
I'm not sure where the ancient wrym is in Terathan, I haven't been in there since they screwed with the Fel spawn, but I do remember one of our hunts trying to get into Terathan Keep when a balron was near the entrance...it was a near disaster as over half the party was eaten right there at the beginning...so the lesson you learned is not a new one. Moving large scale groups past a nasty monster should definately be avoided.