There is one thing that is very different and might not be apparent from looking at schedules from 30 years ago.
Programming was more cross-demographical, in other words one particular programme would be intended to be watched by a large cross section of society.
Contrast that with today and the extreme narrowness of programming, it's rare to have a programme that is intended to be watched by a wide social group and both men/women.
I think it's this narrowness that is killing TV. Spreading out the available audience so fewer and fewer people are watching the same thing of an evening.