I think Gaming and Tech would be fine to group together, especially as you are likely to have threads/posts within Gaming that are themselves grouped, so we don't need the extra level for just 'gaming'.
Debate and Ask Nautilus would work well as Discussion, but maybe another, less boring, name would be cool?
I'm not sure rolling Meta into discussion would work, as you are talking about different things, I think meta would more likely cover community management in a practical sense, and probably support. Not quite as discussy, more doo-ey ? hehe
Ask Nautius ^^
I like the idea of the 'experiences' category, encompassing what you mentioned. I think we could call it "People", because it would be a place to share and discuss things which are more personal than everywhere else.