For races like that, ear protection is a must.
Some form of web device with a timing page also helps a lot, or, focus on following a few "hero cars" that are the ones you really keep track of.
The amount of visual info a track's score board and present can make a big difference to. Darlington in South Carolina has a set of lights to display the numbers of the top 10. Charlotte has a much much more on display, making it easier to follow.
I personally, prefer to attend qualifying sessions, less crowd.(Not a problem with an Indy race though!)
Being there, lets me pick what I want to see, on TV, you see a replay of a pass happening(if that). You rarely see the work done to set that up.
The way series use degredading tires, it is far more boring to watch these days as drivers are running at 80%.