I had two endoscopies...one with very little sedation and one with none. I had no sore throat after either procedure.
I attribute that to the fact that when you're a little wakeful (or wide awake)you can help by swallowing down the tube. When you're out cold, they can force it down, and have no idea how it's affecting you. If you think you're up to it, being sedated, but awake can make things a lot easier.
I wouldn't have known I was capable of it, if my first doctor hadn't given me very light sedation for a colonoscopy/endoscopy combo procedure. The other benefit is a very short (or no) recovery.
I know it's not for everyone, but you might just be surprised!