At work, I'm in meetings much of the time, and I was lucky to get 4 hours of my my old MBP, if I didn't charge it over lunch, it wouldn't last the day. (there are chargers in meeting rooms, but only a few, so can't always count on getting one).
At home, I work in a few different seats (one of them is a desk with a big monitor, but for emails/reading, I prefer to sit elsewhere, including on the back deck in nice weather), all but one does have an outlet, but it sure is nice to be able to get up and move around without constantly plugging/unplugging the laptop. Magsafe does make that easier though, only takes a second to plug in and no big deal if you stand up without unplugging, it doesn't pull the laptop out of your hands or the charger out of the wall.
At home, I work in a few different seats (one of them is a desk with a big monitor, but for emails/reading, I prefer to sit elsewhere, including on the back deck in nice weather), all but one does have an outlet, but it sure is nice to be able to get up and move around without constantly plugging/unplugging the laptop. Magsafe does make that easier though, only takes a second to plug in and no big deal if you stand up without unplugging, it doesn't pull the laptop out of your hands or the charger out of the wall.