Huge NFL Films fan for years - used to watch all of them as a kid. My favorite NFL Films (other than bloopers) was Super Bowl 3, but done to a Castle theme with Kings, Wizards, etc.
The "This Week in the NFL" highlights show every Saturday night was a must-see in the early 70s. The music, dramatic slow motion sequence, and John Facenda's narration made the sport larger than life. I think it turned a lot of kids into rabid football fans.
On a side note: I don't think the "Knight in the NFL" segment on the scoreboard last season was nearly as effective without the NFL films music... Even the opposing team would watch when they heard that music come on the scoreboard!