The "Renew" adult education courses that are being used in many Catholic parishes now are based on the Catechism. They lead the students through the basic outline of the Catechism, with guides for discussion and further reading.
The courses are very popular in our parish, they are usually full. According to Renew, 20 dioceses and 7 archdioceses are participating in this program. So you can do the math = a bunch of Catholics who are reading their Catechism in detail.
As for the kids, I know they learn the Catechism in Confirmation class because I sat through a good part of it, plus they had a Catechism review course for the parents of confirmands, and I attended that too.
My daughter is teaching a Renew course at her college in Charlotte NC, one of the participating dioceses. They're getting around!
Thanks for this information, AAM
I still stand firmly behind my claim that very, very few Catholics, especially on a relative basis, have read the Catechism.