Yep...19. I have 19 cookie sheets. Mostly I use them to transport cookies from my "holding area" (dining room table) to my "decorating area" (kitchen table).
Which ones do I use for cookie baking? After experimenting, I prefer the dull looking cookie sheets; I'm sure they are sold as non-stick, although I always use parchment paper. I've tried the professional half sheet pans...they feel nice, very stable and weighty and not bendy at all, but those result in a cookie that is really soft on the bottom. That's great, but I like them a little more sturdy since I'll be handling them during decorating and usually bagging and boxing them. A little bit of brown on the bottom helps.