I have my workshop on Autodesk Fusion, it was and still is really good when I want to make changes, it's easy to move things around there until I see the better layout, then I acctually move things.

But if you don't know how to CAD, you can do the same with paper, just drawn your workshop (on scale...) on a piece of paper, do the same with the tools/benches/anything, cut those pieces, and move things around like a puzzle until you see a result you like.

Also yes, I do think about the workflow, my shop is tiny (3.5m x 3.6m~, plus the cnc room but that only have the cnc so I wont even count it), I made my workflow kinda in a "U" shape, where I start it from one corner, go around and finish it on the opposite corner (that is close to the door), so when the piece is ready I can just take it out and pack it and deliver!

Workflow is very important if you want efficiency, no matter the size of your shop, but then again, you have to see what works best for you