I am also very OCD when it comes to exploring. I feel it necessary to explore every marker on the map and search every street, building, metal case, etc.
Like many other players, I suppose, I'm obsessive about exploring every last nook and cranny. And I have to read every poster, sign etc, even switching to a scoped weapon if I can't get close enough.
And I can never not take a teddy bear, toy car, Nuka-Cola truck or lunchbox.
I don't always take everything useful that's lying around, for example in Megatron, because I think someone else may really need it.
Also, sometimes if I open a cabinet etc and it's just got a single item that I don't want (like a cup), I have to put something else in there with it to keep it company!