Pit traders used them a long time ago. But most have replaced them for more sophisticated computer analysis of support/resistance.
They still seem to work sometimes - probably because there's a new crop of retail traders who've "discovered" the idea. I compared the old pivots with more advanced methods and the pivots can be off by multiple points (usually when it's most important) too often for my taste.
Thursday on the S&P futures is a good example. Pivot was shown as 966.83. But the software I use showed support at 963.49. The intraday bottom ended up being 964.
Maybe not for everybody, but for me 3 points on the ES is significant.