I too used to listen to talk radio in the mid-90's when I was in high school. Unfortunately I can no longer stand the commercial load on talk radio. Internet conservative news has completely replaced talk radio for me. I haven't listened to Rush or any other host in 2+ years.
On Rush's show there isn't one second more of commercial time than 10 years ago.
However, a couple years ago it was discovered that some radio stations were using a "secret" technology that compressed shows by eliminating any spots of dead air and by doing so they could squeeze in over an additional minute of commericals per hour. Can't remember what it was called.
I listen to talk radio all day long. Streamed from various websites, you can listen to commercials without vomitting, I've been amazed.