I have about 40 linear feet of bench space in my garage. Its cheaper to make durable benches out of 4'x8' sheets of 3/4" plywood with another 3/4" sheet of mdf underneath. I cut them to 3'x8' sheets and use the extra 1' as a shelf. You need the 3' bench space for equipment.
Ikea used to make things out of real wood but they haven't in years. Anything other than actual plywood will sag.
I cut 48x96 sheets into 48x32 benchtops, I find that ideal. Deep enough to hold a lot but shallow enough to still reach the shelves.
Use Gorilla glue to laminate a piece of thin (1/4" or 3/8") ply to a piece of rigid pink foam board, with another piece of thin ply on the bottom. This foam-core sandwich is stiff but lightweight, acoustically dead, and very cheap. You can use a ton of random objects or just a vacuum-bag to apply the lamination pressure. Stick some one-by on the edge and radius it with a router, and you're done.
Ikea used to make things out of real wood but they haven't in years. Anything other than actual plywood will sag.