After truck driving, I am now doing Medical Transport and I will say, I ALWAYS wash my hands after Literally Everything! I drive people that have everything you can think of and I do not want to catch some of the things these people have or can transmit.
I am in and out of clinics and hospitals SO much, this is Habit for me now and forever. Toilet is no exception. And after: I use the paper towels and sanitizer wipes to open bathroom doors, hold door with foot and then throw towels away.
Think of all the people that do not wash their hands... in EVERY place you walk through and do and touch stuff. Then touch your private parts with all that accumulated otherpeoplehandstuff. I'd rather prevent than just touch.