I wanted to ask why not the more simple form:

echo '"foo","bar,baz","boo"' | awk -F"\",\"" '{print $1}' "foo

echo '"foo","bar,baz","boo"' | awk -F"\",\"" '{print $2}' bar,baz

echo '"foo","bar,baz","boo"' | awk -F"\",\"" '{print $3}' boo"

Realizing that I have to strip the quotes that remain.

Edit. formatting.

EDit, again, from your link, the following is more terse and too my taste (still needs strips):

awk -v FPAT='("[^"]*")+'