The Maverick (or whichever thermometer of choice you use) is an invaluable tool. It really takes the guess work out of the equation. This was the single most important key for me to become confident in my schmoking abilities.
Don't mean to hijack your thread, aks. I have a WSM 22 as well, and absolutely love it. The Mav is a big reason I have enjoyed my WSM so much, as it has helped me get the most out of my WSM.