I think a person's enjoyment of racing can be greatly increased by knowing what to watch for. Unfortunately, watching on television can make it difficult to see beyond passing and wrecks.
I like seeing what different lines around the track the drivers choose; high, low, different at one end from the other, 'diamonding' a turn vs. staying on the bottom, etc. A few laps of this and you can see if the driver is gaining or losing time on the car in front. You can also sometimes tell which drivers are going hell-bent for leather and which ones are saving their stuff for later or getting the most from their gas. But that requires being able to watch the same car or two for several consecutive laps, something that's only possible at the track.
The tube rarely pays much attention to what's going on outside the top 10, except at plate tracks. (Okay, I'll grant the plate tracks that much - most of the field will fit in one camera shot, excluding JGR.
) There often some great racing on going back in the pack. Yeah, it may be a few MPH slower but when four cars are under a blanket, can you really tell if they're running 150 vs. 155? And unless it's Kyle Busch in an X race, you usually don't get to see penalized drivers making their way back to the front. Most of Denny Hamlin's charge at M'ville happened off-screen.
New fans of every sport benefit from having a veteran fan explain things to them, but it's tough to point out these aspects of racing when watching on television. That's one reason why non-fans think it's just cars going around in circles. You can explain it, but it may not make much sense if they can't see what your talking about.