Time to chill out and read was definitely my favorite part about commuting by train (SEPTA). Unfortunately it also ate a lot of my time, but it was time I could spend reading so I didn't really mind that too much.

> getting into the "work time now" mindset

This is actually the reason I never liked WFH. I don't want to be in the work mindset at home, it degrades my ability to relax at home.