probably not the reply that will be popular, but given the thread title,

i love drag racing, in any form, but heads up racing is not one of my favorites, I'd watch it, (and do on occasion at Milan on the first Friday of each month, <plug plug>) BUT it makes me feel like i'm watching an never ending run of time trials.
not putting it down, because I think there is room for all forms of racing, but I dont see the excitement when someone rolls up in a prostock chassis car, with a mountain motor on nitrous outrun the field by a second or more.
To me its not about whos in the stands, if you need that validation then it wont matter what racing you participate in, I like the competition, I like that you can roll up in anything and race it and you win or lose based on your ability and not just on your pocketbook.

so heres a vote for bracket/index racing.