I feel like this is a side effect of "binging" shows. When you watch something week to week, you have a chance for some natural excitement to build up and give yourself a break if you didn't like a particular episode. Trying to power through so many episodes at once ends up feeling like a chore, no matter how much you like a show.

I'll often take a break from shows for a few days, or even weeks, when I start to feel things drag, and when I go back to them, I limit myself to one or two episodes at a time to keep from getting burned out again.