Yeah, can't say that I haven't done that, I have. Not a grab it and see kind of thing, just a quick finger swipe.
I can't say that I haven't shorted circuits to find the breakers, I have...many times.
So far as 110v hurting, in the US there really isn't any 110v unless voltage drop is a factor. 120 volt is the norm with the usual voltage measuring between 116v to 118v. The amount of hurt varies. Depends on how you receive the shock and how grounded you actually are. I've been zapped literally hundreds of times. It happens over a 45 year span as an electrician. Is it fun...NO...in fact, HELL NO. The worst is across the chest, makes you think. When working hot, you always try to keep being grounded to a minimum. Been burnt severely also but that's another story.