You only appreciate stone circles when ypu get up close to them. I've been at Stonehenge with the rising of the Sun (quite memorable), but the stones at Avebury just down the road feel more special. Perhaps something to do with the tv series 'Children of the Stones', but they are... eerie.
As to why stones have been dragged/floated/(teleported!?) hundreds of miles? Stonehenge was a special place, and to make it even more special, it required extraordinary efforts to build. Hence materials being moved incredible distances.
I think the immediacy of today makes construction of edifices over several lifetimes seem extraordinary. But back in the day, that was the way of things. Designers of large buildings such as cathedrals knew that they likely wouldn't live to see their dream become reality; but that didn't matter. I think back then people accepted being a small cog in a much larger machine. Which is the entire opposite of how things are today; hence our amazement/incomprehension.