At work I tend to handle very hot circuit boards as they're coming out of the oven. I've been doing this for a couple years now. Anyway, I used to think that my MBP got very hot near the hinge, but now it doesn't seem so bad.
If it is actually so hot it burns you, you should stop using the Magsafe adapter and take it into an Apple store. Do you see any burned or melted plastic on the connector or in the plug?