Yes I can concur that it is often necessary to give a blast of air to front and rear screen, but its usually cleared in less than a minute.
This is what I've experienced in my Mk 3 Ex, which is also garaged and yes I usually drive with the Climate Control permanently on.
Its no big deal to touch the demist button on and off, its such a short space of time before the windows are clear anyway, particularly the front the fans just blast it clear in literally seconds.