Runners High on treadmill?

I’m training for my first marathon and have exclusively done almost all of my running on a treadmill and it was mostly miserable on my long runs. Finally was able to do my 14mile run outside for the first time because the weather was nice and it was like night and day difference of how much more enjoyable it was. Which leads to my question, is there anyone who gets a runners high or really enjoys long runs on a treadmill?