So here's my report back. I had never tried to really flatten anything with hand planes before. I've knocked off high spots before using the jointer and planer, but that doesn't really count. So I started out feeling both "yikes, I'm gonna hack up my brand new workbench top," and "well, where better to start than a 3" thick workbench top."
The top was crowned in the middle by 1/16 or 1/32 so there was a fair bit to remove. I did all the work with the Veritas jointer plane. I started off with the toothed iron and then switched to the 38 degree iron. The toothed plane did a great job of taking deep cuts without tearout, but I can also see why one person suggested to skip it and just go with the regular iron. That darn A2 was hard to sharpen but seemed to hold up pretty well; I probably did a total of 8 relatively light diagonal passes, which seemed like a lot but I felt like I learned something with each pass. I think I took 1/16 to maybe 1/8 off in total. Probably a lot more than one of you with skills would have needed to do.
This was work, but I really learned a lot over a few hours. Lots of repetitive planing means lots of time to figure out how to tune a plane. All in all I did a decent job, I think. Here's the finished product - the Chris Schwarz bloodlines are obvious. Benchcrafted leg vise ($300) and a 7" Wilton from craigslist ($30) plus some veritas toys. I'm sort of chicken to put a bunch of bench dog holes in, but that's the next step.
new workbench.jpg