Hi Tweak,
I have used temperature-controlled soldering irons for most of my long life. They heatup to operating temperature very quickly, don't cause overheating damage to components, heat more at full power to solder something that is big, and allow the tips to last almost forever. No oxidization. The rosin in the solder doesn't turn to charcoal and therefore does its "wetting" job properly.
Try one and you won't use the old "too hot" kind anymore.
All you can do for your oxidized tip is to sand it gently (it might have a thin layer of plating under the oxidization) and tin it immediately.