I've had a bit of code in my vimrc that creates "next/previous" text objects for a while. Someone came along and helped me make it more compact a while ago, but I can't remember who.
It lets you use "din(" for "delete in next parens (on the current line)", which saves a bit of typing.
https://bitbucket.org/sjl/dotfiles/src/1b6ffba66e9f/vim/.vim...
Maybe I should turn it into a pathogen-installable plugin one of these days.