Eh, should MS really be lecturing people about browser design? Honestly, if you don't like it, disable it. If you're smart enough to know what it means, you're smart enough to find out if its optional. I can think of far worse things the "average user" might do then have google or whichever search engine see what you type in the address bar.
There is no excuse, if you value your privacy then you should do your research. It's mind-numbingly naive to assume "default settings" will cover that for you.