I'm not in weight watchers but the title "volume" caught my attention. I agree with kaplods analogy with spending (though I've had minor issues with money that mirror my food issues). In both areas, I tend to feel too much entitlement to "binging" then "starving". I'll go a long time without over doing it then spend more than I want. Nowadays, I never kill my overall budget but I feel uncontrolled anyway.
On the volume topic, I was talking with my friend about our preferences and needs for food. She would never ever skimp on creaminess, texture and such for her food. I however deal solely in how high my plate is within my calorie budget. I've switched noodles to bean sprouts with my stir fry so I can have a huge heaping plate. I constantly look for whole food items that are very low in calorie. I learned it from Volumetrics (by Barbara Rolls) and it's really helped me. I fill up on all these water-rich foods (plus I usually drink a couple or more glasses of water).
I almost never eat processed foods because the servings are too small. I'll eat a massive plate of lettuce just because I want the huge plate. I've gotten down to sprinkles of dressing (never heard of when I was growing up), too. I drink almond milk because it's 40 cals for a whole cup. I try to avoid fake foods (except I do use Truvia for sugar). I just prefer tofu to meat, mushrooms to more dense items, pickles instead of mayo, and such.
There's lots of info about density, volume, and at
www.nutritiondata.com there's nutrition info on "satisfaction level" (or something like that) for each food (based on the same principles).
I'm all about volume for weight loss and maintainence.