To me, it feels good and makes me happy. Why not use it as an excuse for a pissup?
That’s not the point. It was suggested that the sun was being worshipped and the “longest day” was somehow “spiritually” significant.
Of course the original Pagans were doing exactly what you describe. The same for Wassail at the other end of the seasonal cycle.
The hippies and the like at Stonehenge on June 21st are just displacing church attendance because they think that it’s better to worship something evidential.
The event itself has no inherent significance other than, as you say, marking it with a party.
Worship itself being simply an act triggered by a psychological mind set of poor internal self-imaging being acted out, makes it doubly, as I said before, risible.