I see your point. That's why I reformulated my explanation in my previous post.
You are right. Some upvotes can be followed by "Cool!", "That's so funny!" and "Good point", and things like that. It isn't always "I agree". Both could require explanations. But that would be a headache for admins, so I don't know...
I don't see, however, why would someone have a problem with people giving love, virtual hugs, I don't know how to call it, but that's so cute and tender, I like it, that's what giving +1 means to me, and I like to do it (provided I agree; I would never upvote a user I like if he/she says, I don't know, something like "OoE sucks"; neither would I downvote him/her; I'd just disagree with a post, neither +1 nor -1; but that's just me).