I think it depends on the person.
In my case I followed that advice a number of years ago. Got rid of the scale for a few years and slowly put on weight. I put on a few pounds without noticing and then the new season comes and I need to buy some new clothes and I end up buying clothes that are slightly bigger (like those brands that have the same number in the size, but fit bigger). Then more time goes by, a few more pounds go on, and the next time I need clothes I have to buy the next size up.
I need a scale, because I am a bad judge of what I see in the mirror (getting fatter, but not noticing) and how my clothes are fitting. I can see over a week if I've put on pounds and do something about it right away instead of being oblivous.
Female, age 51, 5' 9"
SW - 183 (Jan 22, 2012), CW - 159, GW - healthy.
Met my 2012 goals by losing 24 pounds.
2013 goals are to get fit and strong!