We'd have higher quality, lower cost water and roads.

"Government agencies less likely than private to comply with environmental regulations, study finds" Here are key points from the article linked below:

For power plants and hospitals, public facilities were on average 9 percent more likely to be out of compliance with Clean Air Act regulations and 20 percent more likely to have committed high-priority violations.

For water utilities, public facilities had on average 14 percent more Safe Drinking Water Act health violations and were 29 percent more likely to commit monitoring violations.

Public power plants and hospitals that violated the Clean Air Act were 1 percent less likely than private-sector violators to receive a punitive sanction and 20 percent less likely to be fined.

Public water utilities that violated Safe Drinking Water Act standards were 3 percent less likely than investor-owned utilities to receive formal enforcement actions.

http://archive.news.indiana.edu/releases/iu/2015/10/when-gov....

Here's another viewpoint on the benefit of road privatisation: http://blogs.reuters.com/great-debate-uk/2012/03/22/road-pri....

As far as "imagining" what it would be like with private water and roads -- instead of imagining, perhaps we ought to look at the topic rationally.

Here's another (opinion) article about privatized roads:

http://www.americanthinker.com/articles/2012/05/a_glimpse_of....

https://fee.org/articles/privatize-public-highways/

And here's an academic study about water privatization benefits in Argentina: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=648048