Thor is also one of few of our heroes familiar with what the Infinity stones are too.
Edit: As for the power coming from within or enhanced by the weapons, the movies have always been a little unclear with regard to the power of Asgardian weaponry, other than whoever can weild the hammer shall weild the "power of Thor". Aside from Odin giving a glimpse of his power a couple of times (again, how much of that is him or the weapon?), Gungnir never really seemed that special on screen. (I don't know the comics or indeed they mythology to know how special it may or not may be)