You're absolutely right. Everything is different. In 1929, we had gold & silver behind our money. In 2008, we don't.
In 1929, the US had plenty of manufacturing facilities where we weren't dependent on foreign countries for our basic industrial needs. In 2008, we don't.
In 1929, it was a great insult to take a mortgage on your house. In 2008, it isn't.
In 1929, the US had enough farmers to feed everyone in America and export to the rest of the world. In 2008, we have more people in prison than we have farmers.
If you want to laugh at that, go for it. You won't be laughing when you are standing in the bread line, sharing the shortage with the rest of the communists.