Question: I would like to have the same editor available on all of the platforms I frequent.

Emacs and Vi are not desired solutions.

Answer: 
We set the default workspace for students at a high school by modifying the shortcut properties. In this case, we operate a Windows 7 environment. The default workspace is on a student's network share mapped as the H: drive so we added **-data h:\workspace**. The screenshot shows exactly where.

![enter image description here](https://i.stack.imgur.com/CB1aj.png)
Old question, I know, but just wanted to point out that you may need to add quotes around the target workspace path. For example; I tried `C:\Eclipse\eclipse.exe -data E:\Eclipse Projects2` and it would open a blank, default, workspace while doing `C:\Eclipse\eclipse.exe -data "E:\Eclipse Projects2"` allowed it to use the existing workspace. I'm guessing this varies based on OS and/or Eclipse version, but I'm not sure exactly what factors into this, so just try both ways until you get one to load the correct/existing workspace.