I have severe obsessive compulsive disorder, have done since i was 5, so i am obsessive about washing my hands. Knowing other people don't wash their hands after the toilet is the most grim and disgusting thing.
Genitals are dirty with germs, every time you use the toilet, germs get left behind, which breed and multiply very quickly, especially in the warm conditions of a groin. Unless you can magically undress without touching your clothing, use the toilet, not wipe, and re dress without touching your clothing, you DO get germ transfer on to your hands, and you then transfer those germs on anything you touch.
I even wash the tap after turning it on and washingg my hands, then wash my hands again, just so the germs i transfered to the tap when i turned it on with my dirty hands, dont transfer back on to me.
I use antibacterial wipes pretty obsessively throughout the day too, not just on objects but my hands.
Although i don't specifically wash my hands before eating. I'll get up off my sofa, go grab a packet of crisps, pre packed sandwich, a pasty out the fridge etc, and don't wash my hands first. All of your other examples though, absolutely.