The /corporate_portal_templates_v2/src/jsp/common/top_declarations.inc still contains declarations for Document Listing template and filters/sorters for unused templates. These filters/sorters just use resources (and decrease the performance) and unneeded container declarations (doc listing) on the home page.
I would REMOVE (not comment out) all unused templates (as we did for 5.0 SP3) as the garbage that is left after them will never be removed by the template developer (as nobody really understand what should be included exactly).
We should deliver a production-ready set of template as many customers will use them without any modifications.
And if additional templates are needed, they are always available from our online repository.
I would also disable the verbose garbage collection for the same reason - we are delivering a ready for production server and not the dev. environment. Many customers do not even know, how to disable it Customers even more lazy than developers. nobody will clean up templates 
Or our vision has changed and we indeed would like to build the complete development release but with some commented out templates?
What do you think?
It could be that this was already discuissed (developer meeting or architect meeting?) and I have missed it and just asking silly questions? 
In this case excuse me in advance, please, for spreading panic
I think the GC verbose will actually help us understand what is going on in production servers. I agree that are not beautiful, but neither our our logs