I raided so hard in vanilla and BC that I burned myself out on it for life. Nowadays I can't even tolerate a single wipe or more than an hour-ish of being glued to my chair. I only do lfr once per wing to see the content, get the achieve and then wash my hands of it...unless I have some kind of quest that requires more. And I wait until the content is weeks or even months old and on LFR farm.