i have heard and it and there was time when i also use to recite it after Friday prayer but they didn't use those words of "Gous e Azam"
This is a kind of love and respect they show to Hazarat Muhammad(S.A.W) and the same way they do other things like kissing their thum and touching them to their eye when their hear the name of Prophet Muhammad (S.A.W) and what they explain is this act is of Hazarat Adam when he was shown the pic of Prophet Muhammad(S.A.W) on his thum and that was love so this is also love when i say to my family that their is better way of expressing love and affection to Prophet Muhammad (S.A.W) by saying Darood and their is a Hadith too on it but a long debate they do it .........
and now they call me too ******e ...
i don't know why they go after what their parents did but not go after the sunnah
May Allah Give show them the right Path