It would be really nice and improve productivity a lot if you could store,
restore  and directly switch between different arrangements of window in the IDE.

This could be done via a submenu "Arrangments" (or something similar) at the top
of the "Window" menu. This submenu would hold the following entries:
- Entry "Create new arrangement..." would open a new dialog where you can
specify a name and take the current window arrangtement and store it under that
name.
- Entry "Restore current arrangement" to restore the current arrangement to the
state under which it was stored.
- Submenu "Stored arrangement" where you can select and hence switch to a stored
arrangement.

In essence I would like to see something that is similar (or actually basically
the same) to the perspective functionality that can be found in Eclipse. You can
 also take a look there what other perspective functionalities are available and
perhaps sensible in the Netbeans context.