Not a lawyer or accountant either, but my understanding is that a single-person LLC is only useful if you're holding business debt: if your company goes bankrupt, your personal assets are much harder to go after. For liability, you're exactly right: you can't pass off liability to a piece of paper when you're the only person in the company.
I get flak for this whenever this discussion comes up, but personally I have a side project business, and it's a sole proprietorship. I looked into incorporation but could not find a single positive attribute to it, for my situation. My situation is: 1) I'm the only person, and 2) I have zero debt involved with the business. So for me, there just isn't any good reason to incorporate; it would only increase my costs and force me to waste a bunch of time on extra paperwork for nothing.
All these people touting incorporation seem to have several assumptions, one being that you must necessarily go into debt to start a business (not true), and the other being that surely you must have employees or partners (also not true). Just look at some guy who starts a lawn-mowing business: if he buys his own mower out-of-pocket, and does all the work himself, what the heck does he need a corporation or LLC for?