Mine is plugged in from Saturday evenings until Thursday night when I know I'm taking it to work. Plugged in about 8 hours on a Friday, and about 24 hours at my girlfriend's from Fri-Sat. So, it gets plugged/unplugged about 3 times per week, and I cycle the battery about every 3-4 weeks. I've never removed the magsafe by pulling on the cord, but by gently removing the plug with 2 fingers. It would be easier though if the plug part of the magsafe were bigger.
Tom
Tom