I never used to bother with coloured tracks ,I just used to use folders to keep things organized like guitar folder ,keys folder ,vocal folder and drums folder etc .
right from sx3 days right up untill just recently I always had the default grey but have started using coloured tracks,
I always liked the look of it when other people organized it in lovely groupings of colours fading in into different shades lol,
folders work just as well in reality,and you can hide the whole group if you close the folder , Colouring the folder would work actually.then you could see where you were quickly.