Yeh, colorise is not my 'go to' tool either but it's a good short cut to extreme colour changes when the Hue can't get you there and you temper it's destructive effect with some desaturation and/or opacity. Most of what I do ends up in print so I always have CMYK in the back of my mind even when working in RGB. Curves are nearly always my first port of call when handling colour issues, followed by Hue and colour balance. After that one needs to treat the other colour tools with caution for danger lies within! lol.