"having to wait around doing nothing until your transport arrives. It's a constraint on your schedule and adds a certain amount of stress to your day"
Otoh, it replaces the latency and stress of rush hour.
Otoh, it replaces the latency and stress of rush hour.
This leads me to suspect that the stress of waiting for public transit is largely incidental and could be reduced by better station design, without having to make any (difficult, expensive) improvements to service frequency and reliability.