It was the first technology I learned for database driven web development in 2003 and I got plenty done with it at the time. It really made it easy to get started since it was simple to write and understand. But when I changed positions and stopped working in a "ColdFusion shop", I learned PHP and Python, and haven't seen a need to check back in to see how ColdFusion is doing over the past 10 years. I began freelancing, and people often want things like Wordpress and Drupal customizations, or for you to install a bulletin board, or want you to know Django or Flask. The demand for ColdFusion developers just isn't there so that knowledge has mostly been erased from memory.