I tend to let postal mail pile up until the pile becomes so depressing that I have to open those things. Everything I get is billed electronically now except for my water/trash/sewer bill, so I'm really in no hurry to look through those Explanations of Benefits, bank statements, and prospectus after prospectus after performance update from Fidelity. Finally, I get some courage and wade through all of the crap I got in a given week or two. I spend so much of my time looking through mail of some sort. I probably spend an hour or two a day dealing with email at work, then I come home and spend another half hour to an hour dealing with email... after all that, it's hard to be motivated to look through the crap that I know I won't care about that comes in stupid paper envelopes.
Holy crap, I just discovered that the payment coupon that comes with my Visa statement contains my entire credit card number. I don't know how many times I've thrown those away without noticing that.