The power and ease of Glance is addictive. It is well worth the small amount of drain. I honestly wonder why some are so afraid of Glance gobbling their battery. That's a boogey-man story. I've used it in several phones and no one will convince me to stop.
I agree... its negligible. Running FB or IE or WhatsApp etc consume loads. I used to monitor my usage, install battery apps etc... after awhile, I realised why bother!!!. If battery level drops then its time to recharge.