I wonder how many Joe Sixpack viewers are googling "Sam/Dean" right now.
Can't speak for the fans who take Supernatural completely seriously but, god, that episode was fun!!!
ETA: And hee again, I just found out that the nagging fan"Simpatico" from the fanboard on the show is a real poster. Just read a few of his posts on the TVWP Forums and he really does sound exactly as begrudged as on the show. *bg*
ETA: If you need brilliant fanfic to go with it, here it is:
And awesome pink raygun review that includes a pretty nice explanation of slash attraction.