I have to admit smaller government probably benefits me, but it is assinine for the average person to be in favor of it - the great majority of people will be much poorer under the new laissez-faire regime. Anyone remember the nineteenth century?
I don't advocate complete laissez-faire, though moving towards that direction would be good. No government interference can result in monopolies, cartels, and trusts - the bad aspects of capitalism, which works best when things are competitive. Less unnecessary regulations would make goods cheaper to produce, and therefore in a competitive environment that would make goods cheaper - everyone benefits from that, both sellers and buyers on all levels. Less taxes would give people more money to spend, once again benefiting buyers and sellers. Devolution(giving duties currently run by the federal government to state and local governments) can result in more efficient and customizable services.
Also, it's kind of hard to compare a laizze-faire 19th century to a laizze-faire 21st century - technology has come a great distance, and the Industrial Revolution is over. It would be much different.
I would strongly recommend you read 'The Iron Heel' by Jack London. It was written around 1904, and foresaw a great many things that are present in our modern society. Also has much economic commentary.