Just when you think you've exhausted the GMAT Club well of knowledge, you realize there is still so much more! Great discussion
For the last two weeks or so I have been debating whether or not to apply to Harvard/MIT. In fact, I have been working on the essays because it's the only school (Harvard) that seems to have released them. The one thing that was really bothering me was how I was going to get to Boston from L.A. for a visit (in addition to the visits to Yale for the second time, Cornell, and Tuck). I guess it has been revealed that visiting HBS isn't really necessary as they don't keep track, and there are no specific why Harvard questions. It was also good to find out that MIT does have a school specific question, so that should be taken into account also.
For what it's worth to anyone here...I attended the Duke diversity weekend last year. I called the admissions office to ask if I should re-apply for the weekend this year. They said they would rather reserve the space for individuals who had never attended. However, they *highly* recommended that I talk about my experiences at the weekend in my essays. Take that for what it's worth.
Also, I agree with gixxer that you can do these visits on the cheap. A few hundred for a plane ticket, cheap motel, try to hit a location that has multiple schools in the vicinity. Try to crash on a friends couch even. I did that when I visited Wharton...a buddy of mine was going to law school at Rutgers-Camden, which is just a short trip over the bridge.