I have three projects in my eclipse workspace:
EventKitchenCore
EventKitchenDesktop
EventKitchenAndroid
EventKitchenCore
contains
I would say as some contributors suggest, to use maven or ant. The configuration is easy, most of them have already put them, so it is a matter of copy and paste. When you are in the development environment, what you can do is to add the projects in your build path. Go to build path and select the "projects" tab and add the projects you need, so every time you make changes, all the changes are visible for the projects that are linked. When you are about to deploy, you can then use the maven or ant. However, you can start with both of them in development as well. But if you want a quick fix, I would suggest to reference the projects if you don't want to use maven or ant yet. But when you deploy I strongly recommend to use one of this two project managers, because as you mentioned, export the projects as jars and then add them to the libraries folder is a pain.