Traffic was average for a large, busy, city - not horrible like media says. You don't need to speak, read, or understand any Thai at all - in Bangkok, the majority of Thais know some English, and for every sign that's in Thai only, there are 3 with English. GPSs don't work too well in Central Bangkok - too many tall buildings and metal structures. Transportation is excellent, taxis are everywhere. Our dollar goes far - on average you get double what you get in the States for your dollar.
Exceptions are imported goods - they cost the same or more than they do at home.
No crime, no graffiti, no bums, almost no litter, very few beggars - but lots of pushy touts and sales people. And Thais in Bangkok do expect tips from foreigners. Shopping in Thailand is best if you are a small lady, or wish to buy trinkets to decorate, food, or orchids. Nothing else seemed to be a real bargain in Thailand. And, while prostitution and sleazy places are in Thailand - you won't find any pornography or nasty stuff unless you really want to seek it out.