I've been thinking about this recently, I understand in PVE the usefulness of not having collision detection, when you need to make quick "get out of the fire" decisions something like collision detection could be more of a hinderance.
However, what do you think about Collision detection in PVP?
The ability to protect your healer, or save someone by forcing them to get through you first. The way you could stop a player from literally running THROUGH you to stop your casting, they would actually have to get around you, For rogues they have shadow dance to get behind you and with a quick reaction would have to kick to interrupt instead of running through the player.
This could also work great as a form of bringing strategy back to the game. Formations, protecting the flag carrier, finding a way to penetrate a team. Now that rated BG's are coming, Im thinking this would be a fun mechanic to have enabled when you enter PVP area's, and disabled in PVE scenarios.
What's your take on collision detection?