I for one pay a lot more attention in raids then I do in dungeons and maybe youre doing the same thing? Sometimes ill run dungeons laying on my couch with my controller up in front of me but I never raid this way. It could also be the same reason people are far far more likely to get into a car accident within 5km of their home then across the city. Youre so comfortable with the area and the content you start making mistakes...like a 30 year carpenter cutting his fingers off.