Does power efficiency matter for GPUs?

When you see people comparing GPUs, things like FPS per watt aren't usually at the top. Users like to see how much performance they're getting for the price. Getting a more power-efficient GPU is always a bonus, but it's rarely a deal-breaker for gamers or enthusiasts. If you're a laptop user, however, things can look pretty different pretty fast. The same is the case with HTPC users or those running a workstation, where power bills might be a bigger concern.