Hello,
Yes, well, I am one of those people that don't worry about matching the water temp. But when I do do a water change, I add the water over a long period of time, at least an hour sometimes two. I do this for two reasons, firstly so there isn't a fast drop in temp and secondly if there is a difference in Ph between ph in the tap and the tank, then the Ph will change slowly.
Man alive, if I was in Chch, I would even do water changes. I would setup an overflow on the tank and continuosly add new water at a slow rate, equal to 5% of tank volume per day.