I have a three bay garage, 30' x 36', and am running out of room.
I use the center bay (with the lift) when I need the use of a lift; otherwise, it stores the utility trailer which doubles as a work bench and temporary storage. It's easy to maneuver outside when needed.
When I am working on the workbench, my DD is too close to the bench, so it moves outdoors. Then I have a good 20x10 work floor to lay out parts, wires, and whatever when I work on wiring harnesses.
So far, having two possible bays to work on projects seems to be adequate. I haven't done sheet metal work in quite some time; that is what takes a lot of room (welding slag, grinding dust, etc.)
I have two storage rooms, and they are jammed pack!