Actually my very first experience of Asia was of a limo taking me from BKK to the city centre and it was full of the things! I remember thinking "if this is Asia you can keep it..."

I think avoidance is best - be aware if sitting outside in the evenings near standing water or vegetation.

Frankly I think you have no need to worry at all re malaria for the locations you've given.

From my experience entertaining UK people in SE Asia, the biggest risks are upset stomachs (over indulgence/unfamiliar food), colds/other bugs etc (perhaps lower resistance thanks to tiredness from jetlag or over ambitious travel schedules), alcohol/smoking related problems (cos its cheap), and accident (perhaps from doing stuff you'd never do in your own country - riding on the back of a motorbike).

I don't think you're being paranoid - just try and balance all the risks. I don't take malaria tablets, but I always pop an aspirin and walk around alot on long flights in case DVT gets me. Perhaps that's paranoid...