The bodb welcome page is shown to people who are not logged in, or when someone selects: BODB main page, a BODB tour, or help etc...
Once logged in, a user would have as the main BODB page a page that shows his current workspace: the user could have the option to switch workspace, create new workspace etc.. (maybe a page that is not one of the current workspace page, but a one that offers a synthetic view of the current workspace + options to create/switch workspace, etc..)
I think it would (1) make much clearer the fact that you are working in your workspace, (2) make it much more personal: you can see what you have been working on, what are the entries you have looked at (3) avoid having the user always staring at the static welcome page (which is not a great feeling, something that most modern websites avoid.