Lots of my coworkers at Salesforce.com use standing desks. One example that comes to mind is someone who's had long term back problems. It's made a massive difference for him. Most people here can get them with manager approval and many could get them anyway.
But why do I keep having to remove line cards from an MLX-16 or PCIe cards...
You're right in some environments, but not all. And I'm not including anything as small as you're implying.
My main site is 492KB for the front page and all of it's content, including images. Any loads other than the first are around 42KB due to browser based caching.