That's only part of the truth. Digital lines carry more electricity than analog lines and may actually irreparably damage your modem. It's usually not an issue in residences but when visiting a business, always ask for an analog line. Most office phones have features, such as displays for date and time, that require more electricity than the majority of modems can handle. Never put personal data or programs that can't be easily recovered on the laptop.
Most companies have a policy against storing personal data or programs on company computers.
Your laptop may, someday, unexpectedly require service. The computer support staff can't really take the time to safeguard your personal files. If your laptop is the only place you're storing last year's tax records or your child's homework, you may be in trouble. Never allow friends or family members to use your business laptop. Small indiscretions can sometimes lead to big problems.