Hey everyone quick question. I've had my WSM 18.5" for a few years. I love it, but find it to be a royal pain in the @$$ to clean it. i usually fill the water pan with water and i foil the pan, but it still becomes a mess to clean. I've always filled my pan with water, but I see some people do and some people don't. What are the advantages and disadvantages of filling the water pan with water??