Same here, I've left everything alone (nor did I "buy on the dip"). I fiddled with my allocations a little bit back in 2012 once, when stupid F*ing Congress was playing chicken over the federal budget and debt ceiling, threatening default. The markets were set to go crazy, so I moved towards a more conservative allocation, then moved it back after the nonsense was over a few weeks later. In the end, I'm pretty sure I would have ended up basically the same either way, whether I had left it alone or moved money around as I did.
I've also largely adopted the theory of "Once you've won the game, quit playing." Once I accumulated enough, I moved to a safer stock/bonds allocation I'm comfortable with (about 60/40). As a result, my balances didn't move down that much with the recent market swings so I don't really have to sweat it out anyhow.