Regarding disposable plates and utensils, I actually don't see much of them unless you ask for takeout. I suspect in the area you're in the cost of dish washing is more expensive than the cost of plates and refuse collection. A tax on disposables would be great.

Singapore is actually getting better on reducing disposables, though slower than I would like. Cashiers don't double bag items anymore, and try to pack as much into one as possible. Paper takeout boxes and bags have replaced styrofoam and plastic in many places, and it's currently trendy to not offer plastic straws for drinks.

Another reason for disposable chopsticks, (though this applies more in China, Taiwan and Malaysia) is that the customers may not trust the hygiene of the place they're eating in. Disposable chopsticks are cut with the centers intact so it's impossible to put them back together and resell them.