Well, for that specific case (it was a well defined block that could be all selected and commented out in order to disable it), your technique would have worked

Well, for that specific case (it was a well defined block that could be all selected and commented out in order to disable it), your technique would have worked fine, true :) But of course it can get tiring and not be very practical if the logic to disable is a little bit more spread out (I'd say having to "if false" anything more than 2 paragraphs or blocks of code would already start to feel annoying)