I agree.
The best, and cheapest, workbench that I ever had was made from a commercial solid core door bought from the salvage store. That thing almost killed me getting it home because of it's size (10' tall) and weight (about 185 lbs) and 2 1/4" thick, but once I made it into a workbench top it was bullet proof. I left it in my last house basement shop when I moved to NC and have never had a shop since then that was big enough for such a bench, so I have yet to make a replacement for it. It had what looked like a rosewood veneer on both sides, so I used a piece of tempered 1/4" MDF on the top, held on with carpet tape and did the same to attach it to the 4 X 4" stand that I built for it, thinking that I might want the veneer in good condition for something else some day, but it was still a workbench when I moved away and the carpet tape held it and the MDF in place perfectly. The door was new, never installed, and in perfect condition when I bought it and I think I paid $20 for it.
Charley