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Let's say I have been working in a given Vim session for some time, and come to a point where I really would like to have everything I am looking at in GVim instead.
The actual use-case is a terminal Vim session with a large number of windows... I'd like to click-activate them instead of going through Ctrl-W each time, something that can be done in GVim but not Vim (not mine, at least).
Is there a way to take the buffers / windows / tabs currently open in Vim, and open them in GVim instead?
You can use the :gui command to open the current session in GVim.
See :help :gui for the gory details.
That's what sessions are for. In terminal Vim, you save your current setup via :mksession Session.vim, quit Vim, and then launch GVIM with that session: $ gvim -S Session.vim.
You can influence what gets persisted via 'sessionoptions'. I'd recommend to remove storing the mappings, that reduces the session size significantly: :set sessionoptions-=options. Also, there are plugins like session.vim - Extended session management for Vim that simplify the handling.
set mouse=aactivates mouse support for terminal Vim as well, making Vim windows click-activateable...