I wholeheartedly agree and also extend this to software I write. I try very hard to have booleans never be called e.g. disableFoo. It isn't always easy, but you glue enough logic together and then try to say it becomes very difficult. This becomes even more true when you have a language that has unset or null type values and then configurations for those settings where the logic gets even nastier because usually you want unset to be false. If you have a negatively declared variable in this case, you have to check if it is true OR it is unset, whereas if it is a positively named thing, simply checking for a truthy value is adequate, more concise, and less error prone.
