I am Asian and had blepharoplasty done some six months ago. That's basically the medical term for double eyelid surgery. Its probably not too common with westerners because westerners already do have double eyelids, its probably more of an Asian thing. I had double eyelids before the surgery but they were beginning to droop and I wanted a bigger crease so I went for surgery for them.
As for the scary factor mentioned here, its pretty scary I think. Not the most scary thing I have done in my life thus far but probably somewhere around the fouth or fifth scariest thing. The plastic surgeon injects the anesthesia into the eye to numb the area and he starts to operate when the numbness sets in. Although my eyes were closed, I swore the operating lights above me were so bright I could see a little of it filtering though my closed eyelids as the doc was operating on me. It was a 40mins or so procedure and I was soo relived when it was over.
My parents, especially my mother is very opposed to plastic surgery so I hid it from them when I had the op. My mom kept asking me after I did my eyes if I did them, but I just vehemently denied it! For myself personally, I am open to plastic/enhancement surgery but would prefer that people do not know I've had work done, because I feel some people cannot except it and can have quite a malicious attitude towards it. My close family do know I've had blepharoplasty but I won't consider telling my distant family members (as many of them cannot except plastic surgery). And yes, plastic surgery can be quite expensive, I paid around USD2400 for this simple procedure (In plastic surgery terms, double eyelids is one of the more simpler procedures that does not require hospital stay and is performed in the clinic itself.)
I have also tried botox to treat the frown lines between my eyebrows to stop frowning. I did one session and was quite satisfied with the result but have yet to try it again due to the cost. As for the cosmetic benefits of these procedures I've tried, I won't say the result has been great. I don't have people making sudden comments on how different my eyes look now, or that the frowning I am so proned to is reduced. I'm basically still a very regular looking girl who wears spects, probably sort of geeky looking and hardly outstanding, nowhere near the beauty peagent type.