You could always put carpet on the floor with a cushiony padding underneath. Be a lot easier to stand on for extended periods. It would make it difficult to drag the proposed retractable wheels on the bench but everything is a trade off. Lighting seems a wee bit sparse too. Thinking you could consider new led lighting on dimmer switches could be a nice touch. Maybe even some you can change color or better still, ones that rotate colors. Now that would really dres it up in there. Add some class.
On a more serious note, back in the day, after retirement, when I had a workshop, I place a lot of stuff on the walls and in many cases made small brackets/holders for them. Helped pass the time and making the holders gave something to do on days when weather sucked. Of course, a good sound system and collection of Merle Haggard cd's are a game changer as well.
Just trying to think of ways to assist in spending your money.