i know you asked for never ever's and the only thing never ever about me is to never relax again LOL (dang they took away the smilies).
i use heat occasionally and prefer blowing it out more than flatironning. whichever i do the appliances are always on their lowest settings and i always use heat protectants even for a warm/cool blowdry.
i'm also very concerned about heat damage so i keep it down to maybe every couple months but it's gotten to the point where flatironed hair feels weird and i prefer keep some texture by lightly blowdrying over the stick straight look and i really prefer natural styles above either one.
Sometimes it's nice to switch things up and enjoy your hard work by doing what you want to do when you feel like doing it, you just have to be very careful.
funny you posted this topic cause i just did a light blow-out this morning hehe.
eta: @ least with a blow-out, who cares whether it reverts or not
!!!!