Just wait until you start needing some of the information from the record the user is looking at.  You cannot get that in the local dev environment.  You have to start deploying it to the instance for testing.  I like the fact that it allows customization of the UI but ServiceNow has a really long way to go in there documentation.

One major item I would like to see ServiceNow do is when you deploy a component it will deploy both the version it does now and also a version that is the local project so if something happens you can pull down that version to your local system and continue to work on it.