I've been slowly creeping towards downvoting for the better part of 2 years as I comment very infrequently. I imagine it'll be anticlimactic once I get there, but it's relatively exciting to be so close—it's the last frontier of Hacker News-ing.
It seemed to take forever, and I was counting the numbers when I was at like 490, but now the downvote buttons are there, I find it's very rare that I get a chance to wield them in anger.