I have the same brain grumble with track/pavement running. I tend to do all my running in trails and parks (or did, back when I went outside in the before-times), so there's pretty nature to look at. Plus, the added challenge of uneven terrain is fun. Audiobooks and podcasts are also great for this, it occupies my brain and helps justify the time spent.I hit 8 and 1/2 miles in my half-marathon training today. I'm kinda at odds with myself over it. On one hand, there is part of my brain saying, "Woohoo! 8.5 miles! You never thought you could do this in your life! Go you!". And then there's the other part of my brain, "You just spent almost 2 hours straight running. Just. Running. Why would anyone want to run for 2 hours? This is a tremendous time sink! One hour is plenty! This is so impractical!".
Needed to say, once this half-marathon is over I don't plan on being a long-distance runner.