IMO if you're bored when spinning on rollers or a trainer, you aren't paying attention. Live in the moment. I was on my rollers for three hours this week, nice sunny days, but I needed the rollers more than I needed outdoor miles. I listen to music, but don't like distractions when riding indoors. Except for spin class, which is a social interaction and thus fun that way, too.

OTOH, maybe if I rode centuries on the rollers I'd like to watch TV just fine. As it is, my legs usually start to hurt pretty good after an hour and a half and that keeps my mind occupied.

That said, I never could like "stationary bikes," either, in the sense of those contraptions one usually finds in a gym. But your real road bike on rollers is a whole 'nother animal. I usually hit my rollers and then either ride or drive to the gym for a weight workout, or else hit the weights after a spin class.