On debugging, traditional vimmers might want to try Conque GDB: http://vim.sourceforge.net/scripts/script.php?script_id=4582

But honestly, even though I've kept this installed, it still feels foreign enough that I usually just run gdb (or cgdb) in a separate terminal anyway. If I ever make the jump to neovim, I'll be curious to see how much of a native feel can be given to things like this.