Mention queries, and writers of all ages sprout a few more gray hairs. The first rule of #AskAgent chats on Twitter is No Query Questions. I haven't yet come across a writer who looks forward to writing one or an agent who adores slogging through hundreds of them to find a few gems. (If you're out there, give a shout.)
No one really likes them, but I get why they fall under the "necessary evil" category. And it's not like there aren't resources out there to help - enough blogs to overload anyone's browser, for starters.
More here (courtesy Crossing the Helix)