When I'm finished gaming, I tend to go to the game's menu, then press Home button, quit game from there, eject disc from PS3 (triangle>eject) and power off.
I had your same issue...I'd suggest doing what I did but faster...it took me about 1 year to finally give up
Just buy a bluray laser or deck. It can be a bit tedious installing it, but it's fun and well, your bluray will work.
Here's 2 places you can get it from:
PS3 Blu-Ray Drive Laser Replacement Tutorial - ConsoleZombie.com - YouTube
PS: The second link is for PS3 Slim ONLY. You can find a table online of what laser model each system has; but I would go the safe way and open up your PS3 and check yourself (remove the deck and check the label on it's underside...)
Good luck and, any questions, please feel free to ask. I'm no expert but, I'll try my best