I actually have a lot in my two-car garage. But one of the things that makes it look less cluttered is that I made the decision to never have a second car in it. The other thing that helps is having cabinets to store everything.
There's more information on the garage at
The 12-Gauge Garage. (Please don't take that as any kind of spam. I don't make money if you go to the site. In fact, I have to pay for it.)
Jack Olsen
1972 Porsche 911 widebody in a mostly-green garage