(Plus I like watching the video feed from the camera. How many other people have seen the inside of their colon, live? It's cool!)
After about the 4th? time I had it (I've had 9 cardioversions, along with many types of surgeries), I realized I liked propofol. By the 6th time, it was the highlight of any procedure. I found that the high comes from trying to fight the anesthetic and the amazing quality of sleep you get, plus I will agree the wakeup is tricky. Be careful about what you're really obsessed with, as you'll likely talk about random aspects of your hobby as you come out of the stupor.
The next best thing, I would say is Demoral, which gives me the instant feeling of being peak-drunk without the need for all the troublesome alcohol. Anything acute and severe, that cannot be immediately triaged, can justify getting an injection. This drug is very tightly controlled now.
I do avoid pain killers as a personal policy, to ensure I am aware of what's going on in my body at all time (since it's a delicate thing). That being said, I can understand Michael Jackson's addiction.