There are apps like Plane9 (very similar to Milkdrop from Winamp) and the commercial Luminant Music. I'd say FL Studio's integrated plugin ZGameEditor Visualizer is probably the top alternative considering the sheer number of presets and templates as well as configurability. They're all listed at AlternativeTo.

https://alternativeto.net/software/projectm/

There is a standalone visualizer that is my go to, projectm. It's a spiritual successor to the visualizer from winamp days and is compatible with the old milkdrop presets.

I haven't been able to find a proper way to set up mesh size on windows but if you're running it on linux or android, those options are available too.

https://github.com/projectM-visualizer/projectm

Just tried it. Like you said, it mimics Winamp Milkdrop but it has not aged well.