I usually have it on my training screen that shows lap time, 3s power, lap power, np power, %ftp, hr and cad but don't really look at any of it unless I'm off the front and then I'll keep an eye on power so I don't get too excited. In a crit, I'll set auto lap and just look at lap times to get a feel for the race. In a TT I use avg power, np power and hr.