There are other languages that I learned during that time too, though. Stuff like Perl, ActionScript, VBScript and others. I guess you can still use some of them, but they have fallen out of favor. I would give away a puppy to have the brain-space and time that those took from me.
My question; do you have a crystal ball? How can you tell what you should be investing your time to learn? Have you only been lucky?