For me, it depends. Usually there's a tripod in the trunk of my car, and usually I have a camera body and a "walkaround" lens in a small backpack that I can easily grab.
But mostly, I do not bring all my camera gear anywhere. Instead, I have lists on my computer of the equipment I need for specific kinds of outings. That way I can quickly pack what I need without worrying about forgetting something, and without overpacking and bringing stuff I don't need that will just weigh me down.
For a day baseball game, it might be a long lens, a monopod, and a raincover. For long exposures at night, I'll bring a tripod, my wired remote shutter release, a manual-focus lens, a red LED flashlight to see by, and other flashlights for light-painting. For a nature hike, a macro lens and a wild-angle zoom.
I have several different camera bags, and sometimes leave a couple packed with different gear for different situations. Some venues limit the type or size of bag they allow (a lot of places are "no backpacks" since Boston), so I consider that, too.