No 'quick questions', no 'leaving for the store, you need anything?'.
If you work from home, you also use the internet the same way you would at the office. No social media, no browsing /., etc.
Lol, you're acting like people in an office are perfectly productive and have zero distractions. It couldn't be further from the truth, in fact when I really need to be 100% productive I turn on my noise cancelling headphones and tune out the office because there are SO many distractions and my ADD will let them take over if I allow it. Nope, if people are being less productive at home it's probably because management is not being effective without being able to shoulder surf. Set expectations and dole out reasonable workloads and you can get the same work out of people as you could in the office. It's true that certain interactions in the office are net positives for the employer, but many, many of them are a drain. The key is to capture as many of the positive ones with the technology as possible.