They are venomous, just not as dangerous as brown recluse or black widows. If one actually got on me my injuries from getting it off of me would probably be worse than the actual bite;-)
My chicken and duck areas are clear from bushes and I keep everything mowed and weedeated. But, the area is in a shady spot that is very close to a tree line. I picked the spot for the shade but evidently it is spider central. The nooks and crannies are where they congregate, the inside of the duck house is the worst. When I lift off the roof to clean is where I find most of them.
People always tell me most spiders are harmless, they can't hurt you, blah blah blah. A heart attack is very harmful, and that's what I'm likely to have when I see one.