I'll amend my earlier post to say this, since somebody mentioned those huge webs that a monster sits in the middle of...
The only spider I'll definitely let alone, and am fascinated by, is an orb weaver. I do like them.
Had one last summer that spun a web in the corner of my back sliding door, and late at night, every other night or so, I could stand there and watch it spin a new web. There was an outdoor patio light nearby that would attract moths and flying bugs, so it's web would get torn up after a couple days, and it would have to make a new one.
That spider I found interesting. Other ones, not so much. Definitely not black widows. Those really creep me out. When I first moved into this house, I used to RAID the ones I found in the garage, but as other posters have said, it's an exercise in futility. There are always more of them. So as long as they stay in the garage, I pretend I don't see them.