I've used a light duty wooden workbench that came with a house I bought in '95 till recently. Moved that bench twice. It's functional and will continue to be used in our basement as an odd job work and storage. (18hp command hiding under the sheet)
In 2010 I added a 6' beast of a workbench made from pallet rack metal and 3/4" plywood. The fellow that made it incorporated electrical outlets and a steel plate to mount my Rock Island vise. I really like its design so in my new shop there is adequate area for more workbench area.
When the local Sears store closed at the mall I bought 2 complete 10' tall x 8' long pallet racks for equipment storage, 1-12' tall end rack (green & slightly damaged) and 4-6' orange horizontals with anticipation I'd fabricate a similar workbench to one above. I cut the metal for the legs and end horizontals
Mark, my neighbor who did the window treatment and wood trim around the walls cut the plywood on his table saw and helped me secure it in place on the new steel frame. No need at this time for extra electrical outlets but those can be added later if needed.
We had to shim up the supports under the top +/- 1/4" to make up for my engineering gaps. I need to drill and screw the top into the metal and then I'll decide if I want to sand and seal the plywood or leave it natural. Today is December 31, 2018 so its a good end to one year and start to another.