I'm amazed how many people reach my sites by searching for the domain name itself (site.com). My teen-targetted and general sites all show the same pattern. I'm sure it's been brought up b4, but still find it very interesting.
I generally don't like a lot of things in my drop down bar so will search for site name on google. Not really laziness as it's the same thing to type it into the address bar and not really ignorance because I know I can. I dunno why I do it.