When I was in the military I used them almost exclusively in the field. Cut a couple of appropriately sized twigs, shave the bark off and you have 1 minute chopsticks. Works great for ramen and for reaching into the bottom of MRE pouches. Works great for manuevering small coals, etc. too.
I have the Snowpeak take-down chopsticks, but it's a little tiresome assembling and disassembling all the time.
Now I usually use one of my Ti sporks, especially the folding ones, because they makes me feel more manly using titanium...I'm a sad, little man. Actually I seem to have some weird obsession with camping utensils as I'm always buying new ones when I find something cooler.