MVP and Unit Testing in ASP.NET

His picture notwithstanding, it's pretty clear that J.P. Boodhoo is an intelligent guy. I watched one of his screencasts about MVP in ASP.NET and unit testing and I'm a little puzzled. He creates four class library projects to support this paradigm: one for the models, one for the presentations, one for tasks and and another for the DTOs. Even with Resharper, that seems like a lot of work to create a web form with four fields. I'm interested in hearing the arguments for unit testing something as simple as this.