I have the same exact issue. I some time think of getting it connected but then leave as the cooling is great and i usual use the manual turn of switch after 15 minutes or so.
Its negative effects are high fuel consumption, engine remaining at load thus heating and load on electrical system as both radiator and condenser fans are on all the time.
i would suggest, if your routine trips are of more than 1 hour then get it connected as i will do it too.
cheers