Divvy, http://mizage.com/windivvy/ has worked well for me. Lets you re-size windows to a grid, either by click+draging over the the relevant grid area or by setting up hotkeys. I set up hotkeys for fullscreen, top half, bottom half, left half, right half, and the four quadrants, but the grid is fairly precise and flexible so there's a lot you can do with it.

I'd rather be exterminated Dalek style. Quick, hopefully painless, and would mean I got to meet The Doctor first (and his attractive companion at the time). Exterminate! Exterminate! Exterminate!

My friends and I have long since found a solution to trivial decision making through randomization. If nobody has strong opinions about where we eat, or what activity we do, etc we use a random number generator (typically a die or a coin) pick from a list and go. However I wouldn't say we do this is a effort to save mental energy, as much as to save time. Either way though it's easy to keep some variety without having to waste time/energy on decisions.