You most likely need to realise the power of less, begin to edit your life and minimalise all but the essential things (it takes weeks if not months to create a minimalist lifestyle but its worth it, a good book to read is "the power of less"). GTD doesn't really place much emphasis on minimlising rather the emphasis is on managing it all.
That way your brains won't worry you've "lost" something but you are free to deal with what you can realistically do now.
Oogie McGuire - Mac, iPhone & Omnifocus
OogieM on Twitter
Paonia, CO USA
The practice of Kanban is a methodology that predates GTD but applies some of the same principles. It acknowledges your inventory of stuff and makes it visible with post it notes in three columns, backlog, in progress and done. A central belief to Kanban is that increased throughput makes for more successful work. Less items in progress limits multitasking and complexity. This to me is key success factor in having fun, whether I am working or playing
I actually found once I reached peak levels of minimalism in my life it kind of eradicates the need for a complex productivty system like gtd.
I still like to use key gtd elements but I hardly need a system to be honest.