Mine was also saw heavy Blu-ray usage at first, but I've been using a stand-alone for a while now instead. That being said, I use PS3 every day, just not for Blu-ray or gaming (I only have two games and almost never play them...not a gamer at all and I'm honestly terrible at it anyway)
I use it primarily for video file playback and photo viewing. After putting a 500 GB drive into it, video/photo file storage and playback is everything to me.
It only gets hot if I do play a disc back, and occasionally if the room itself is hot but otherwise it's fine. My computer's fan is far louder than this ever gets. It's one of the standard 40 GB models.