Here's a post showing how to collapse and expand all of the items in the Solution Explorer.
Your hosting application can provide similar features for the VSTA DTE to make things easier for your VSTA authors.
Get underlying DTE object from VSTADTEProviderClass
IDTEProvider
dteProvider = (IDTEProvider)new VSTADTEProviderClass();
mDTE = (EnvDTE.
DTE)dteProvider.GetDTE(mHostID, 0);
and then your application can alter and manipulate the VSTA IDE to your end user's advantage.